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Allegretti JR, Bordeianou LG, Damas OM, Eisenstein S, Greywoode R, Minar P, Singh S, Harmon S, Lisansky E, Malone-King M, Litwin NS, Weaver A, Heller CA, Moss AC, Adler J. Challenges in IBD Research 2024: Pragmatic Clinical Research. Inflamm Bowel Dis 2024; 30:S55-S66. [PMID: 38778623 DOI: 10.1093/ibd/izae083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Indexed: 05/25/2024]
Abstract
Pragmatic clinical research is 1 of the 5 focus areas of the Challenges in IBD Research 2024, a multidisciplinary effort by scientists, clinicians, patients, and funders to identify priorities for patient-centric research. This summary provides a comprehensive overview of current gaps in inflammatory bowel disease (IBD) clinical research and actionable approaches to address them. This review is focused on identifying research that is needed to achieve the best outcomes for patients in clinical practice. Research gaps include understanding the needs of understudied patient groups and addressing barriers to care so all patients receive optimal care, validating and using biomarkers to enable early diagnosis and result in better outcomes for adults and children with IBD, and determining the optimal sequencing of treatments (medical, surgical, adjunct) in children and adults. Inclusive pragmatic research is needed to address these gaps and lead to improvements in patient care and outcomes for all populations of patients with IBD.
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Affiliation(s)
- Jessica R Allegretti
- Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital, Boston, MA, USA
| | - Liliana G Bordeianou
- Department of General and Gastrointestinal Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Oriana M Damas
- Division of Gastroenterology, Department of Medicine, University of Miami Leonard Miller School of Medicine, Miami, FL, USA
| | - Samuel Eisenstein
- Division of Colon and Rectal Surgery, Department of Surgery, University of California San Diego, La Jolla, CA, USA
| | - Ruby Greywoode
- Division of Gastroenterology, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Phillip Minar
- Division of Gastroenterology, Hepatology, and Nutrition, Cleveland Clinic, Cleveland, OH, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Siddharth Singh
- Division of Gastroenterology, Department of Medicine, University of California San Diego, La Jolla, CA, USA
- Division of Biomedical Informatics, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Sabrina Harmon
- Division of Gastroenterology, Hepatology, and Nutrition, Cleveland Clinic, Cleveland, OH, USA
| | - Eugene Lisansky
- Patient representative for Crohn's & Colitis Foundation, New York, NY, USA
| | - Myisha Malone-King
- Division of Gastroenterology, Hepatology, and Nutrition, Cleveland Clinic, Cleveland, OH, USA
| | | | | | | | - Alan C Moss
- Crohn's & Colitis Foundation, New York, NY, USA
| | - Jeremy Adler
- Susan B. Meister Child Health Evaluation and Research Center and Division of Pediatric Gastroenterology, C.S. Mott Children's Hospital, Michigan Medicine, Ann Arbor, MI, USA
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Schroeder MK, Abushamma S, George AT, Ravella B, Hickman J, Elumalai A, Wise P, Zulfiqar M, Ludwig DR, Shetty A, Viswanath SE, Luo C, Sebastian S, Ballard DH, Deepak P. TOpCLASS Expert Consensus Classification of Perianal Fistulizing Crohn's Disease: A Real-World Application in a Serial Fistula MRI Cohort. J Crohns Colitis 2024:jjae056. [PMID: 38642332 DOI: 10.1093/ecco-jcc/jjae056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Indexed: 04/22/2024]
Abstract
BACKGROUND AND AIMS Perianal fistulizing Crohn's disease (PFCD) is an aggressive phenotype of Crohn's disease defined by frequent relapses and disabling symptoms. A novel consensus classification system was recently outlined by the TOpCLASS consortium that seeks to unify disease severity with patient-centered goals but has not yet been validated. We aimed to apply this to a real-world cohort and identify factors that predict transition between classes over time. METHODS We identified all patients with PFCD and at least one baseline and one follow-up pelvic (pMRI). TOpCLASS classification, disease characteristics, and imaging indices were collected retrospectively at time periods corresponding with respective MRIs. RESULTS We identified 100 patients with PFCD of which 96 were assigned TOpCLASS Classes 1 - 2c at baseline. Most patients (78.1%) started in Class 2b, but changes in classification were observed in 52.1% of all patients. Male sex (72.0%, 46.6%, 40.0%, p = 0.03) and prior perianal surgery (52.0% vs 44.6% vs 40.0%, p = 0.02) were more frequently observed in those with improved class. Baseline pMRI indices were not associated with changes in classification, however, greater improvements in mVAI, MODIFI-CD, and PEMPAC were seen among those who improved. Linear mixed effect modeling identified only male sex (-0.31, 95% CI -0.60 to -0.02) with improvement in class. CONCLUSION The TOpCLASS classification highlights the dynamic nature of PFCD over time, however, our ability to predict transitions between classes remains limited and requires prospective assessment. Improvement in MRI index scores over time was associated with a transition to lower TOpCLASS classification.
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Affiliation(s)
- Matthew K Schroeder
- Division of Gastroenterology, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
| | - Suha Abushamma
- Division of Gastroenterology, Cleveland Clinic, Cleveland, OH, USA
| | - Alvin T George
- Division of Gastroenterology, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
| | | | - John Hickman
- Division of Gastroenterology, University of Virginia, Charlottesville, VA, USA
| | - Anusha Elumalai
- Mallinckrodt Institute of Radiology, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
| | - Paul Wise
- Section of Colon and Rectal Surgery, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
| | - Maria Zulfiqar
- Department of Radiology, Mayo Clinic Arizona, Scottsdale, AZ, USA
| | - Daniel R Ludwig
- Mallinckrodt Institute of Radiology, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
| | - Anup Shetty
- Mallinckrodt Institute of Radiology, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
| | - Satish E Viswanath
- Department of Biomedical Engineering, School of Engineering, Case Western Reserve University, Cleveland, Ohio, USA
| | - Chongliang Luo
- Division of Public Health Sciences, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
| | | | - David H Ballard
- Division of Gastroenterology, Cleveland Clinic, Cleveland, OH, USA
| | - Parakkal Deepak
- Division of Gastroenterology, Washington University School of Medicine in Saint Louis, St. Louis, MO, USA
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Khan SZ, Arline A, Williams KM, Lee MJ, Steinhagen E, Stein SL. The use of core descriptors from the ENiGMA code study in recent literature: a systematic review. Colorectal Dis 2024; 26:428-438. [PMID: 38296841 DOI: 10.1111/codi.16893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 01/10/2024] [Indexed: 02/02/2024]
Abstract
AIM The heterogeneity in data quality presented in studies regarding Crohn's anal fistula (CAF) limit extrapolation into clinical practice. The ENiGMA collaborators established a core descriptor set to standardize reporting of CAF. The aim of this work was to quantify the use of these descriptors in recent literature. METHOD We completed a systematic review of PubMed and the Cochrane Library, extracting publications from the past 10 years specific to the clinical interventions and outcomes of CAF, and reported in line with PRISMA guidance. Each article was assessed for inclusion of ENiGMA descriptors. The median number of descriptors per publication was evaluated along with the overall frequency of each individual descriptor. Use of ENiGMA descriptors was compared between medical and procedural publications. RESULTS Ninety publications were included. The median number of descriptors was 15 of 37; 16 descriptors were used in over half of the publications while 17 were used in fewer than a third. Descriptors were more frequently used in procedural (n = 16) than medical publications (n = 14) (p = 0.031). In procedural publications, eight descriptors were more frequently used including Faecal incontinence, Number of previous fistula interventions, Presence and severity of anorectal stenosis and Current proctitis. Medical publications were more likely to include Previous response to biological therapy and Duration and type of current course of biological therapy. CONCLUSION With many descriptors being used infrequently and variations between medical and procedural literature, the colorectal community should assess the need for all 37 descriptors.
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Affiliation(s)
- Saher-Zahra Khan
- University Hospitals Research in Surgical Outcomes and Effectiveness Center (UH-RISES), Department of Surgery, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
- Department of Surgery, University Hospitals Cleveland Medical Center, Cleveland, USA
| | - Andrea Arline
- Case Western Reserve University School of Medicine, Cleveland, USA
| | | | - Matthew J Lee
- Academic Directorate of General Surgery, Sheffield Teaching Hospitals NHS FT, Sheffield, UK
- Department of Oncology and Metabolism, The Medical School, University of Sheffield, Sheffield, UK
| | - Emily Steinhagen
- University Hospitals Research in Surgical Outcomes and Effectiveness Center (UH-RISES), Department of Surgery, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
- Department of Surgery, University Hospitals Cleveland Medical Center, Cleveland, USA
| | - Sharon L Stein
- University Hospitals Research in Surgical Outcomes and Effectiveness Center (UH-RISES), Department of Surgery, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
- Department of Surgery, University Hospitals Cleveland Medical Center, Cleveland, USA
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Jew M, Meserve J, Eisenstein S, Jairath V, McCurdy J, Singh S. Temporary Faecal Diversion for Refractory Perianal and/or Distal Colonic Crohn's Disease in the Biologic Era: An Updated Systematic Review with Meta-analysis. J Crohns Colitis 2024; 18:375-391. [PMID: 37707480 PMCID: PMC10906955 DOI: 10.1093/ecco-jcc/jjad159] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/20/2023] [Accepted: 09/12/2023] [Indexed: 09/15/2023]
Abstract
BACKGROUND AND AIMS We evaluated short- and long-term outcomes of temporary faecal diversion [FD] for management of refractory Crohn's disease [CD], focusing on outcomes in the biologic era. METHODS Through a systematic literature review until March 15, 2023, we identified 33 studies [19 conducted in the biologic era] that evaluated 1578 patients with perianal and/or distal colonic CD who underwent temporary FD [with intent of restoring bowel continuity] and reported long-term outcomes [primary outcome: successful restoration of bowel continuity, defined as remaining ostomy-free after reconnection at a minimum of 6 months after diversion or at the end of follow-up]. We calculated pooled rates (with 95% confidence interval [CI]) using random effects meta-analysis, and examined factors associated with successful restoration of bowel continuity. RESULTS Overall, 61% patients [95% CI, 52-68%; 50% in biologic era] experienced clinical improvement after FD. Stoma takedown was attempted in 34% patients [28-41%; 37% in biologic era], 6-18 months after diversion. Among patients where bowel restoration was attempted, 63% patients [54-71%] had successful restoration of bowel continuity, and 26% [20-34%] required re-diversion. Overall, 21% patients [17-27%; 24% in biologic era] who underwent FD were successfully restored; 34% patients [30-39%; 31% in biologic era] required proctectomy with permanent ostomy. On meta-regression, post-diversion biologic use and absence of proctitis was associated with successful bowel restoration after temporary FD in contemporary studies. CONCLUSION In the biologic era, temporary FD for refractory perianal and/or distal colonic CD improves symptoms in half the patients, and bowel continuity can be successfully restored in a quarter of patients.
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Affiliation(s)
- Michael Jew
- Department of Internal Medicine, University of California San Diego, La Jolla, CA, USA
| | - Joseph Meserve
- Division of Gastroenterology, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Samuel Eisenstein
- Division of Colorectal Surgery, Department of Surgery, University of California San Diego, La Jolla, CA, USA
| | - Vipul Jairath
- Division of Gastroenterology, Department of Medicine, Western University, London, ON, Canada
- Department of Epidemiology & Biostatistics, Western University, London, ON, Canada
| | - Jeffrey McCurdy
- Division of Gastroenterology, Department of Medicine, University of Ottawa, Ottawa, ON, Canada
- Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Siddharth Singh
- Division of Gastroenterology, Department of Medicine, University of California San Diego, La Jolla, CA, USA
- Division of Biomedical Informatics, Department of Medicine, University of California San Diego, La Jolla, CA, USA
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Schroeder M, Abushamma S, George AT, Balakrishna R, Hickman J, Elumalai A, Wise P, Zulfiqar M, Ludwig DR, Shetty A, Viswanath SE, Luo C, Sebastian S, Ballard DH, Deepak P. Geldof Expert Consensus Classification of Perianal Fistulizing Crohn's Disease: A Real-World Application in a Serial Fistula MRI Cohort. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2024:2024.02.03.24302160. [PMID: 38352377 PMCID: PMC10863007 DOI: 10.1101/2024.02.03.24302160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
Background and Aims Perianal fistulizing Crohn's disease (CD-PAF) is an aggressive phenotype of Crohn's disease (CD) defined by frequent relapses and disabling symptoms. A novel consensus classification system was recently outlined by Geldof et al. that seeks to unify disease severity with patient-centered goals but has not yet been validated. We aimed to apply this to a real-world cohort and identify factors that predict transition between classes over time. Methods We identified all patients with CD-PAF and at least one baseline and one follow-up pelvic (pMRI). Geldof Classification, disease characteristics, and imaging indices were collected retrospectively at time periods corresponding with respective MRIs. Results We identified 100 patients with CD-PAF of which 96 were assigned Geldof Classes 1 - 2c at baseline. Most patients (78.1%) started in Class 2b, but changes in classification were observed in 52.1% of all patients. Male sex (72.0%, 46.6%, 40.0%, p = 0.03) and prior perianal surgery (52.0% vs 44.6% vs 40.0%, p = 0.02) were more frequently observed in those with improved. Baseline pMRI indices were not associated with changes in classification, however, greater improvements in mVAI, MODIFI-CD, and PEMPAC were seen among those who improved. Linear mixed effect modeling identified only male sex (-0.31, 95% CI -0.60 to -0.02) with improvement in class. Conclusion Geldof classification highlights the dynamic nature of CD-PAF over time, however, our ability to predict transitions between classes remains limited and requires prospective assessment. Improvement in MRI index scores over time was associated with a transition to lower Geldof classification.
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Johnson S, Hoch JS, Halabi WJ, Ko J, Nolta J, Dave M. Mesenchymal Stem/Stromal Cell Therapy Is More Cost-Effective Than Fecal Diversion for Treatment of Perianal Crohn's Disease Fistulas. Front Immunol 2022; 13:859954. [PMID: 35784367 PMCID: PMC9248358 DOI: 10.3389/fimmu.2022.859954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 05/23/2022] [Indexed: 11/21/2022] Open
Abstract
Crohn's disease (CD) is an inflammatory bowel disease with increasing incidence and prevalence worldwide. Perianal fistulas are seen in up to 26% of CD patients and are often refractory to medical therapy. Current treatments for CD perianal fistulas (pCD) include antibiotics, biologics, and for refractory cases, fecal diversion (FD) with ileostomy or colostomy. Mesenchymal stem/stromal cell therapy (MSCs) is a new modality that have shown efficacy in treating pCD. MSCs locally injected into pCD can lead to healing, and a phase III clinical trial (ADMIRE-CD) showed 66% clinical response, leading to approval of MSCs (Alofisel, Takeda) in the European Union. It is unclear if MSCs would be more cost-effective than the current standard of FD. We therefore developed a decision tree model to determine the cost-effectiveness of MSCs compared to FD for pCD. Our study showed that both autologous and allogeneic MSCs are more cost-effective than FD in an academic medical center and even in a worst-case scenario with 100% chance of all complications for MSCs treatment and 0% chance of complications for FD, both allogeneic and autologous MSCs are still cost saving compared to FD.
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Affiliation(s)
- Sheeva Johnson
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of California (UC) Davis Medical Center, University of California Davis School of Medicine, Sacramento, CA, United States
| | - Jeffrey S. Hoch
- Division of Health Policy and Management, Department of Public Health Sciences, University of California (UC) Davis, Davis, CA, United States
| | - Wissam J. Halabi
- Division of Colorectal Surgery, Department of Surgery, University of California (UC) Davis Medical Center, University of California Davis School of Medicine, Sacramento, CA, United States
| | - Jeffrey Ko
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of California (UC) Davis Medical Center, University of California Davis School of Medicine, Sacramento, CA, United States
| | - Jan Nolta
- Department of Internal Medicine, Institute for Regenerative Cures, University of California (UC) Davis, Sacramento, CA, United States
| | - Maneesh Dave
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of California (UC) Davis Medical Center, University of California Davis School of Medicine, Sacramento, CA, United States
- Department of Internal Medicine, Institute for Regenerative Cures, University of California (UC) Davis, Sacramento, CA, United States
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Geldof J, Iqbal N, LeBlanc JF, Anandabaskaran S, Sawyer R, Buskens C, Bemelman W, Gecse K, Lundby L, Lightner AL, Danese S, Spinelli A, Carvello M, Faiz O, Warusavitarne J, Lung P, De Looze D, D'Hoore A, Vermeire S, Hart A, Tozer P. Classifying perianal fistulising Crohn's disease: an expert consensus to guide decision-making in daily practice and clinical trials. Lancet Gastroenterol Hepatol 2022; 7:576-584. [DOI: 10.1016/s2468-1253(22)00007-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Revised: 01/14/2022] [Accepted: 01/17/2022] [Indexed: 12/14/2022]
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Johnson S, Ko J, Halabi WJ, Stondell J, Dave M. Fistula Healing Is Low After Fecal Diversion Surgery in Perianal Crohn's Disease. Inflamm Bowel Dis 2022; 28:e17. [PMID: 34448837 DOI: 10.1093/ibd/izab210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
- Sheeva Johnson
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of California Davis School of Medicine, Sacramento, CA, USA
| | - Jeffrey Ko
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of California Davis School of Medicine, Sacramento, CA, USA
| | - Wissam J Halabi
- Division of Colorectal Surgery, Department of Surgery, University of California Davis School of Medicine, Sacramento, CA, USA
| | - Jesse Stondell
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of California Davis School of Medicine, Sacramento, CA, USA
| | - Maneesh Dave
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of California Davis School of Medicine, Sacramento, CA, USA.,Department of Internal Medicine, Institute for Regenerative Cures, University of California Davis, Sacramento, CA, USA
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Tsai L, McCurdy JD, Ma C, Jairath V, Singh S. Epidemiology and Natural History of Perianal Crohn's Disease: A Systematic Review and Meta-Analysis of Population-Based Cohorts. Inflamm Bowel Dis 2021; 28:1477-1484. [PMID: 34792604 PMCID: PMC9527611 DOI: 10.1093/ibd/izab287] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Indexed: 12/26/2022]
Abstract
BACKGROUND AND AIMS Perianal Crohn's disease (pCD) is a potentially severe phenotype of CD. We conducted a systematic review with meta-analysis to estimate cumulative incidence, risk factors, and outcomes of pCD in population-based cohort studies. METHODS Through a systematic literature review through March 1, 2021, we identified population-based inception cohort studies reporting cumulative incidence of perianal disease (primarily abscess and/or fistula) in patients with CD. We estimated the cumulative incidence of pCD at presentation and 1-, 5-, and 10-year follow-up, and risk factors for perianal disease and outcomes including risk of major (bowel resection, proctectomy, ostomy) and minor perianal (incision and drainage, seton placement, etc.) surgery. RESULTS In 12 population-based studies, prevalence of pCD was 18.7% (95% confidence interval [CI], 12.5%-27.0%) with 1-, 5-, and 10-year risk of perianal disease being 14.3% (95% CI, 7.9%-24.6%), 17.6% (95% CI, 11.3%-26.5%), and 18.9% (95% CI, 15.0%-23.4%), respectively. Approximately 11.5% of patients (95% CI, 6.7%-19.0%) had perianal disease at or before CD diagnosis. Colonic disease location and rectal involvement were associated with higher risk of pCD. Overall, 63.3% of patients (95% CI, 53.3-72.3) required minor perianal surgery and 6.4% of patients (95% CI, 1.8%-20.6%) required major abdominal surgery for pCD. Use of biologic therapy for pCD is common and has steadily increased throughout the years. CONCLUSIONS Approximately 1 in 5 patients with CD develops perianal disease within 10 years of CD diagnosis, including 11.5% who have perianal disease at presentation. Approximately two-thirds of patients require perianal surgery, with a smaller fraction requiring major abdominal surgery.
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Affiliation(s)
- Lester Tsai
- Division of Gastroenterology, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Jeffrey D McCurdy
- Division of Gastroenterology, Department of Medicine, University of Ottawa, Ottawa, ON, Canada,Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Christopher Ma
- Division of Gastroenterology and Hepatology, Departments of Medicine and Community Health Sciences, University of Calgary, Calgary, AB, Canada
| | - Vipul Jairath
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada,Division of Gastroenterology, Western University, London, ON, Canadaand the
| | - Siddharth Singh
- Address correspondence to: Siddharth Singh, MD, MS, Assistant Professor of Medicine, Division of Gastroenterology, and Division of Biomedical Informatics, University of California San Diego, 9452 Medical Center Drive, ACTRI 1W501, La Jolla, CA 92093, USA ()
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