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Ray GS, Streeter SS, Bateman LM, Elliott JT, Henderson ER. Real-time identification of life-threatening necrotizing soft-tissue infections using indocyanine green fluorescence imaging. J Biomed Opt 2024; 29:066003. [PMID: 38745983 PMCID: PMC11092151 DOI: 10.1117/1.jbo.29.6.066003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 04/02/2024] [Accepted: 04/25/2024] [Indexed: 05/16/2024]
Abstract
Significance Necrotizing soft-tissue infections (NSTIs) are life-threatening infections with a cumulative case fatality rate of 21%. The initial presentation of an NSTI is non-specific, frequently leading to misdiagnosis and delays in care. No current strategies yield an accurate, real-time diagnosis of an NSTI. Aim A first-in-kind, observational, clinical pilot study tested the hypothesis that measurable fluorescence signal voids occur in NSTI-affected tissues following intravenous administration and imaging of perfusion-based indocyanine green (ICG) fluorescence. This hypothesis is based on the established knowledge that NSTI is associated with local microvascular thrombosis. Approach Adult patients presenting to the Emergency Department of a tertiary care medical center at high risk for NSTI were prospectively enrolled and imaged with a commercial fluorescence imager. Single-frame fluorescence snapshot and first-pass perfusion kinetic parameters-ingress slope (IS), time-to-peak (TTP) intensity, and maximum fluorescence intensity (IMAX)-were quantified using a dynamic contrast-enhanced fluorescence imaging technique. Clinical variables (comorbidities, blood laboratory values), fluorescence parameters, and fluorescence signal-to-background ratios (SBRs) were compared to final infection diagnosis. Results Fourteen patients were enrolled and imaged (six NSTI, six cellulitis, one diabetes mellitus-associated gangrene, and one osteomyelitis). Clinical variables demonstrated no statistically significant differences between NSTI and non-NSTI patient groups (p -value ≥ 0.22 ). All NSTI cases exhibited prominent fluorescence signal voids in affected tissues, including tissue features not visible to the naked eye. All cellulitis cases exhibited a hyperemic response with increased fluorescence and no distinct signal voids. Median lesion-to-background tissue SBRs based on snapshot, IS, TTP, and IMAX parameter maps ranged from 3.2 to 9.1, 2.2 to 33.8, 1.0 to 7.5, and 1.5 to 12.7, respectively, for the NSTI patient group. All fluorescence parameters except TTP demonstrated statistically significant differences between NSTI and cellulitis patient groups (p -value < 0.05 ). Conclusions Real-time, accurate discrimination of NSTIs compared with non-necrotizing infections may be possible with perfusion-based ICG fluorescence imaging.
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Affiliation(s)
- Gabrielle S. Ray
- Dartmouth Health, Department of Orthopaedics, Lebanon, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Hanover, New Hampshire, United States
| | - Samuel S. Streeter
- Dartmouth Health, Department of Orthopaedics, Lebanon, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Hanover, New Hampshire, United States
| | - Logan M. Bateman
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Jonathan Thomas Elliott
- Dartmouth Health, Department of Orthopaedics, Lebanon, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Hanover, New Hampshire, United States
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Eric R. Henderson
- Dartmouth Health, Department of Orthopaedics, Lebanon, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Hanover, New Hampshire, United States
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - NEFARIOUS Study Group
- Dartmouth Health, Department of Orthopaedics, Lebanon, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Hanover, New Hampshire, United States
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
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Bateman LM, Hebert KA, Nunziata JA, Streeter SS, Barth CW, Wang LG, Gibbs SL, Henderson ER. Preclinical evaluation of molecularly targeted fluorescent probes in perfused amputated human limbs. J Biomed Opt 2023; 28:082802. [PMID: 36619496 PMCID: PMC9813435 DOI: 10.1117/1.jbo.28.8.082802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 11/09/2022] [Indexed: 06/17/2023]
Abstract
SIGNIFICANCE This first-in-kind, perfused, and amputated human limb model allows for the collection of human data in preclinical selection of lead fluorescent agents. The model facilitates more accurate selection and testing of fluorophores with human-specific physiology, such as differential uptake and signal in fat between animal and human models with zero risk to human patients. Preclinical testing using this approach may also allow for the determination of tissue toxicity, clearance time of fluorophores, and the production of harmful metabolites. AIM This study was conducted to determine the fluorescence intensity values and tissue specificity of a preclinical, nerve tissue targeted fluorophore, as well as the capacity of this first-in-kind model to be used for lead fluorescent agent selection in the future. APPROACH Freshly amputated human limbs were perfused for 30 min prior to in situ and ex vivo imaging of nerves with both open-field and closed-field commercial fluorescence imaging systems. RESULTS In situ, open-field imaging demonstrated a signal-to-background ratio (SBR) of 4.7 when comparing the nerve with adjacent muscle tissue. Closed-field imaging demonstrated an SBR of 3.8 when the nerve was compared with adipose tissue and 4.8 when the nerve was compared with muscle. CONCLUSIONS This model demonstrates an opportunity for preclinical testing, evaluation, and selection of fluorophores for use in clinical trials as well as an opportunity to study peripheral pathologies in a controlled environment.
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Affiliation(s)
- Logan M. Bateman
- Dartmouth Health, Department of Orthopaedics, Lebanon, New Hampshire, United States
| | - Kendra A. Hebert
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Jenna A. Nunziata
- Dartmouth Health, Heart and Vascular Center, Lebanon, New Hampshire, United States
| | - Samuel S. Streeter
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Connor W. Barth
- Oregon Health and Science University, Department of Biomedical Engineering, Portland, Oregon, United States
| | - Lei G. Wang
- Oregon Health and Science University, Department of Biomedical Engineering, Portland, Oregon, United States
| | - Summer L. Gibbs
- Oregon Health and Science University, Department of Biomedical Engineering, Portland, Oregon, United States
| | - Eric R. Henderson
- Dartmouth Health, Department of Orthopaedics, Lebanon, New Hampshire, United States
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Hanover, New Hampshire, United States
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Streeter SS, Hebert KA, Bateman LM, Ray GS, Dean RE, Geffken KT, Resnick CT, Austin DC, Bell JE, Sparks MB, Gibbs SL, Samkoe KS, Gitajn IL, Elliott JT, Henderson ER. Current and Future Applications of Fluorescence Guidance in Orthopaedic Surgery. Mol Imaging Biol 2023; 25:46-57. [PMID: 36447084 PMCID: PMC10106269 DOI: 10.1007/s11307-022-01789-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 11/01/2022] [Accepted: 11/16/2022] [Indexed: 12/03/2022]
Abstract
Fluorescence-guided surgery (FGS) is an evolving field that seeks to identify important anatomic structures or physiologic phenomena with helpful relevance to the execution of surgical procedures. Fluorescence labeling occurs generally via the administration of fluorescent reporters that may be molecularly targeted, enzyme-activated, or untargeted, vascular probes. Fluorescence guidance has substantially changed care strategies in numerous surgical fields; however, investigation and adoption in orthopaedic surgery have lagged. FGS shows the potential for improving patient care in orthopaedics via several applications including disease diagnosis, perfusion-based tissue healing capacity assessment, infection/tumor eradication, and anatomic structure identification. This review highlights current and future applications of fluorescence guidance in orthopaedics and identifies key challenges to translation and potential solutions.
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Affiliation(s)
- Samuel S Streeter
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA.
| | - Kendra A Hebert
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA
| | - Logan M Bateman
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA.,Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA
| | - Gabrielle S Ray
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Ryan E Dean
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Kurt T Geffken
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Corey T Resnick
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Daniel C Austin
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - John-Erik Bell
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Michael B Sparks
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Summer L Gibbs
- Oregon Health & Science University, Portland, OR, 97239, USA
| | - Kimberley S Samkoe
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA
| | - I Leah Gitajn
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA
| | - Jonathan Thomas Elliott
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA.,Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA.,Dartmouth Cancer Center, Dartmouth Health, Lebanon, NH, 03756, USA
| | - Eric R Henderson
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA.,Department of Orthopaedics, Dartmouth Health, Lebanon, NH, 03756, USA.,Geisel School of Medicine, Dartmouth College, Hanover, NH, 03755, USA.,Dartmouth Cancer Center, Dartmouth Health, Lebanon, NH, 03756, USA
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Bateman LM, Hebert KA, Streeter SS, Nunziata JA, Barth CW, Wang LG, Gibbs SL, Henderson ER. Use of Freshly Amputated Human Limbs for Pre-Clinical Evaluation of Molecular-Targeted Fluorescent Probes. Proc SPIE Int Soc Opt Eng 2023; 12361:1236109. [PMID: 37009433 PMCID: PMC10065840 DOI: 10.1117/12.2650356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
We have co-developed a first-in-kind model of fluorophore testing in freshly amputated human limbs. Ex vivo human tissue provides a unique opportunity for the testing of pre-clinical fluorescent agents, collection of imaging data, and histopathologic examination in human tissue prior to performing in vivo experiments. Existing pre-clinical fluorescent agent studies rely primarily on animal models, which do not directly predict fluorophore performance in humans and can result in wasted resources and time if an agent proves ineffective in early human trials. Because fluorophores have no desired therapeutic effect, their clinical utility is based solely on their safety and ability to highlight tissues of interest. Advancing to human trials even via the FDA's phase 0/microdose pathway still requires substantial resources, single-species pharmacokinetic testing, and toxicity testing. In a recently concluded study using amputated human lower limbs, we were able to test successfully a nerve-specific fluorophore in pre-clinical development. This study used systemic administration via vascular cannulization and a cardiac perfusion pump. We envision that this model may assist with early lead agent testing selection for fluorophores with various targets and mechanisms.
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Affiliation(s)
- Logan M Bateman
- Department of Orthopaedics, Dartmouth Health, Lebanon, New Hampshire, United States
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, United States
| | - Kendra A Hebert
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, United States
| | - Samuel S Streeter
- Department of Orthopaedics, Dartmouth Health, Lebanon, New Hampshire, United States
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, United States
| | - Jenna A Nunziata
- Heart and Vascular Center, Dartmouth Health, Lebanon, New Hampshire, United States
| | - Connor W Barth
- Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon, United States
| | - Lei G Wang
- Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon, United States
| | - Summer L Gibbs
- Department of Biomedical Engineering, Oregon Health and Science University, Portland, Oregon, United States
| | - Eric R Henderson
- Department of Orthopaedics, Dartmouth Health, Lebanon, New Hampshire, United States
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, United States
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, United States
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Streeter SS, Ray GS, Bateman LM, Hebert KA, Bushee FE, Rodi SW, Gitajn IL, Ahn J, Singhal S, Martin ND, Bernthal NM, Lee C, Obremskey WT, Schoenecker JG, Elliott JT, Henderson ER. Early identification of life-threatening soft-tissue infection using dynamic fluorescence imaging: first-in-kind clinical study of first-pass kinetics. Proc SPIE Int Soc Opt Eng 2023; 12361:123610B. [PMID: 37034555 PMCID: PMC10078977 DOI: 10.1117/12.2648408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
Necrotizing soft-tissue infections (NSTIs) are aggressive and deadly. Immediate surgical debridement is standard-of-care, but patients often present with non-specific symptoms, thereby delaying treatment. Because NSTIs cause microvascular thrombosis, we hypothesized that perfusion imaging using indocyanine green (ICG) would show diminished fluorescence signal in NSTI-affected tissues, particularly compared to non-necrotizing, superficial infections. Through a first-in-kind clinical study, we performed first-pass ICG fluorescence perfusion imaging of patients with suspected NSTIs. Early results support our hypothesis that ICG signal voids occur in NSTI-affected tissues and that dynamic contrast-enhanced fluorescence parameters reveal tissue kinetics that may be related to disease progression and extent.
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Affiliation(s)
- Samuel S. Streeter
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH 03756
- Geisel School of Medicine, Dartmouth College, Hanover, NH 03755
| | - Gabrielle S. Ray
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH 03756
- Geisel School of Medicine, Dartmouth College, Hanover, NH 03755
| | - Logan M. Bateman
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
| | - Kendra A. Hebert
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
| | | | - Scott W. Rodi
- Geisel School of Medicine, Dartmouth College, Hanover, NH 03755
| | - I. Leah Gitajn
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH 03756
- Geisel School of Medicine, Dartmouth College, Hanover, NH 03755
| | - Jaimo Ahn
- Michigan Medicine, U. of Michigan, Ann Arbor, MI 48109
| | - Sunil Singhal
- Perelman School of Medicine, U. of Pennsylvania, Philadelphia, PA 19104
| | - Niels D. Martin
- Perelman School of Medicine, U. of Pennsylvania, Philadelphia, PA 19104
| | - Nicholas M. Bernthal
- David Geffen School of Medicine, U. of California Los Angeles, Santa Monica, CA 90404
| | - Christopher Lee
- David Geffen School of Medicine, U. of California Los Angeles, Santa Monica, CA 90404
| | | | | | - Jonathan Thomas Elliott
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH 03756
- Geisel School of Medicine, Dartmouth College, Hanover, NH 03755
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
| | - Eric R. Henderson
- Department of Orthopaedics, Dartmouth Health, Lebanon, NH 03756
- Geisel School of Medicine, Dartmouth College, Hanover, NH 03755
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
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Tang Y, Gitajn IL, Cao X, Han X, Elliott JT, Yu X, Bateman LM, Malskis BS, Fisher LA, Sin JM, Henderson ER, Pogue BW, Jiang S. Automated motion artifact correction for dynamic contrast-enhanced fluorescence imaging during open orthopedic surgery. Proc SPIE Int Soc Opt Eng 2023; 12361:1236104. [PMID: 37034556 PMCID: PMC10078951 DOI: 10.1117/12.2650028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
Indocyanine green (ICG)-based dynamic contrast-enhanced fluorescence imaging (DCE-FI) can objectively assess bone perfusion intraoperatively. However, it is susceptible to motion artifacts due to patient's involuntary respiration during the 4.5-minute DCE-FI data acquisition. An automated motion correction approach based on mutual information (MI) frameby-frame was developed to overcome this problem. In this approach, MIs were calculated between the reference and the adjacent frame translated and the maximal MI corresponded to the optimal translation. The images obtained from eighteen amputation cases were utilized to validate the approach and the results show that this correction can significantly reduce the motion artifacts and can improve the accuracy of bone perfusion assessment.
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Affiliation(s)
- Yue Tang
- Thayer school of Engineering, Dartmouth College, Hanover, NH, USA 03755
| | - I Leah Gitajn
- Department of Orthopaedics, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA 03756
| | - Xu Cao
- Thayer school of Engineering, Dartmouth College, Hanover, NH, USA 03755
| | - Xinyue Han
- Thayer school of Engineering, Dartmouth College, Hanover, NH, USA 03755
| | - Jonathan T Elliott
- Department of Orthopaedics, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA 03756
| | - Xiaohan Yu
- Thayer school of Engineering, Dartmouth College, Hanover, NH, USA 03755
| | - Logan M Bateman
- Department of Orthopaedics, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA 03756
| | - Bethany S Malskis
- Department of Orthopaedics, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA 03756
| | - Lillian A Fisher
- Department of Orthopaedics, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA 03756
| | - Jessica M Sin
- Department of Radiology, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA 03756
| | - Eric R Henderson
- Department of Orthopaedics, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA 03756
| | - Brian W Pogue
- Thayer school of Engineering, Dartmouth College, Hanover, NH, USA 03755
| | - Shudong Jiang
- Thayer school of Engineering, Dartmouth College, Hanover, NH, USA 03755
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Alsaadi TM, Bateman LM, Laxer KD, Barbaro NM, Austin EJ, Garcia PA. Potentially misleading extratemporal lobe lesions in patients with temporal lobe epilepsy. J Neurol Neurosurg Psychiatry 2003; 74:566-9. [PMID: 12700292 PMCID: PMC1738424 DOI: 10.1136/jnnp.74.5.566] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
From a series of 217 consecutive temporal resections for intractable epilepsy between 1993 and 2000, we identified all patients with large non-neoplastic extratemporal lesions. Only patients with known postsurgical outcomes with follow up for more than two years were included. Fifteen patients were identified. All patients had a history of medically refractory epilepsy with clinical and ictal evidence of mesial temporal seizure onset. Eleven patients had extratemporal lesions ipsilateral to the seizure focus, whereas four patients had the lesions contralateral to the seizure focus. Nine of the 15 patients had evidence of hippocampal atrophy on magnetic resonance imaging (MRI). Following temporal resection, nine of these patients (60%) became seizure free (Engel class 1A), two patients were free of disabling seizures only (Engel class 1B), and two patients had a few early seizures but then became seizure free for at least two years (Engel class 1C). Two patients had significant improvement (Engel class 2). Thus, the finding of large extratemporal lesions on MRI was potentially misleading. When clinical semiology and ictal EEG recordings provide evidence of temporal onset seizures, anterior temporal resection should be considered in patients with extratemporal lesions.
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Affiliation(s)
- T M Alsaadi
- Department of Neurology, University of California, Davis, Sacramento 95817, USA.
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