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Vupputuri S, Nichols GA, Lau H, Joski P, Thorp ML. Risk of progression of nephropathy in a population-based sample with type 2 diabetes. Diabetes Res Clin Pract 2011; 91:246-52. [PMID: 21156326 DOI: 10.1016/j.diabres.2010.11.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 10/14/2010] [Accepted: 11/16/2010] [Indexed: 10/18/2022]
Abstract
AIMS Progression through stages of nephropathy has not been well described in a large, well-characterized, population-based study. Our aims were to describe the progression of nephropathy and identify characteristics associated with progression in a U.S. population-based sample. METHODS We identified 10,290 members of a managed care organization who had hypertension and type 2 diabetes, a urine albumin-to-creatinine ratio (UACR) measurement in 2001-2003, and at least 2 follow-up UACRs. Progression of nephropathy was defined as progression to a higher stage of nephropathy than was present at baseline. RESULTS At baseline, 57% had normoalbuminuria, 31% had microalbuminuria, and 12% had macroalbuminuria. The incidence of nephropathy progression (per 1000 person-years) was 94.7, 35.1, and 6.5 for normo-, micro-, and macro-albuminuria, respectively. ACEi/ARB use ranged from 61-67%, except among patients with macroalbuminuria at follow-up. Age, diabetes duration, and A1C were significant predictors of progression. CONCLUSIONS Our study, one of the first to examine the progression of nephropathy in a U.S. population-based sample, showed that among adults with diabetes and hypertension, the burden of nephropathy and its progression may be greater than previously reported. Further, the use of ACEi/ARBs was not optimal.
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Brunet B, Newcomb C, Lau H, Craighead P, Danielson B. Patterns of Referral for Stereotactic Radiosurgery for Patients with Brain Metastases in Alberta, Canada. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Maniscalco B, Rounis E, Rothwell JC, Passingham RE, Lau H. Theta-burst transcranial magnetic stimulation to the prefrontal cortex impairs metacognitive visual awareness. J Vis 2010. [DOI: 10.1167/9.8.764] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Rahnev D, Bahdo L, Munneke M, de Lange F, Lau H. Theta-burst transcranial magnetic stimulation to V1 impairs subjective confidence ratings and metacognition. J Vis 2010. [DOI: 10.1167/10.7.901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Davidson M, Persaud N, Maniscalco B, Mobbs D, Passingham R, Cowey A, Lau H. Awareness-related activity in prefrontal and parietal cortices reflects more than superior performance capacity: A blindsight case study. J Vis 2010. [DOI: 10.1167/10.7.897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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56
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Maniscalco B, Lau H. Comparing signal detection models of perceptual decision confidence. J Vis 2010. [DOI: 10.1167/10.7.213] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Graves T, Lau H. Divided attention and subjective visibility. J Vis 2010. [DOI: 10.1167/10.7.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Carlone M, Daniels B, Goharian M, Lau H, MacPherson M, Dunscombe P. Poster - Thur Eve - 10: User Dependence of Three Radiation Oncology Incident Reporting Ranking Systems. Med Phys 2010. [DOI: 10.1118/1.3476115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Lau H, Tucker MA, Fishbein W. Daytime napping: Effects on human direct associative and relational memory. Neurobiol Learn Mem 2010; 93:554-60. [PMID: 20176120 DOI: 10.1016/j.nlm.2010.02.003] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Revised: 01/28/2010] [Accepted: 02/16/2010] [Indexed: 11/18/2022]
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Rahnev D, Maniscalco B, Huang E, Lau H. Inattention boosts subjective visibility: Implications for inattentional and change blindness. J Vis 2010. [DOI: 10.1167/9.8.157] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Engel-Nitz NM, Darkow T, Lau H. Antihypertensive medication changes and blood pressure goal achievement in a managed care population. J Hum Hypertens 2010; 24:659-68. [PMID: 20107489 DOI: 10.1038/jhh.2010.2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
This study examined achievement of blood pressure (BP) goals, changes in antihypertensive therapy and reasons for these changes among adults with hypertension initiating angiotensin-converting enzyme inhibitors (ACEIs), angiotensin receptor blockers (ARBs) or calcium channel blockers (CCBs). Claims data were examined for changes to medication regimens. Patient charts for 501 patients provided BP levels and reasons for changing medications. BP goal achievement was highest for initiators of ARBs (81.4%), compared with ACEIs (75.5%; P=NS) and CCBs (68.9%; P<0.01). Changes in antihypertensive therapy were least likely among ARB recipients (59.9%) compared with ACEIs (71.86%; P=0.02) and CCBs (74.85%; P<0.01). Failure to achieve BP goals was the most common reason for change in therapy (ARB, 32.9%; ACEI, 42.5%, P=NS; CCB, 47.9%, P<0.01). Although most patients achieved target BP goals, many required changes in treatment regimens. Initial choice of antihypertensive therapy may mitigate changes in therapies and better achieve BP goals.
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Owen T, Besley B, Gabos Z, Lau H. 86 PRELIMINARY RESULTS ON TOXICITY AND QUALITY OF LIFE AFTER STEREOTACTIC BODY RADIATION THERAPY FOR STAGE I NON-SMALL CELL LUNG CANCER: A SINGLE INSTITUTION PROSPECTIVE TRIAL. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72473-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Suh N, Lau H, Pleass H, Nankivell B, O'Connell P, Chapman J, Allen R, Ryan B. SCREENING FOR FUNCTIONAL ASYMMETRY IN POTENTIAL LIVING KIDNEY DONORS. Transplantation 2008. [DOI: 10.1097/01.tp.0000331755.80641.2f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lau H. Recurrence following endoscopic extraperitoneal inguinal hernioplasty. Hernia 2007; 11:415-8. [PMID: 17610025 DOI: 10.1007/s10029-007-0246-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2007] [Accepted: 04/24/2007] [Indexed: 11/26/2022]
Abstract
Recurrence rate is the utmost outcome parameter in determining the clinical effectiveness of any hernia surgery. Between June 1999 and September 2004, six patients presented with recurrent hernia after endoscopic totally extraperitoneal inguinal hernioplasty (TEP). Four of the six recurrences (67%) occurred within a few months after TEP, indicating a technical failure. Of the 1,093 TEPs performed by the author, a total of three patients developed recurrence, giving an overall recurrence rate of 0.27%. All six patients underwent open Lichtenstein hernioplasty. Intraoperative findings showed recurrent indirect inguinal hernia in all patients. Half of the recurrence (n=3) was due to a sliding lipoma without a peritoneal hernial sac. Untreated herniated retroperitoneal adipose tissue into the internal inguinal ring during initial TEP constitutes the leading cause of recurrence after TEP. Routine exploration of internal ring for any herniated retroperitoneal adipose tissue during TEP is recommended. Herniated retroperitoneal adipose tissue should be resected whenever feasible.
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Chen N, Lau H, Kong L, Zeldis J, Knight R, Laskin O. Pharmacokinetics of lenalidomide in subjects with various degrees of renal function. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.2520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
2520 Background: Lenalidomide is a novel oral immunomodulatory drug approved for treating myelodysplastic syndrome (MDS) and multiple myeloma (MM). As unchanged lenalidomide is eliminated predominantly by urinary excretion, the present study investigated the effect of renal impairment (RI) on pharmacokinetics (PK) of lenalidomide. Results were used to refine initial dosing recommendations based on a subject’s estimated creatinine clearance. Methods: The study was conducted at 3 clinical centers. Thirty male and female subjects aged 39–76 years were stratified into 5 groups based on their creatinine clearance (CLCr) values: normal renal function (NRF) (CLCr > 80 mL/min; N = 7), mild RI (50 = CLCr = 80 mL/min; N = 5), moderate RI (30 = CLCr < 50 mL/min; N = 6), severe RI (CLCr < 30 mL/min, but not on dialysis; N = 6), and end stage renal disease (ESRD, requiring dialysis; N = 6). Subjects with NRF, mild, moderate or severe RI received a single 25-mg oral dose of lenalidomide. Subjects with ESRD received 2 single 25 mg doses which were separated by 7–10 days: one dose on a non-dialysis day and the other dose 3 hours before a 4-hour haemodialysis. Assessments included PK and safety parameters. Results: All subjects completed the study. Total and renal clearance of lenalidomide were strongly correlated with CLCr (R > 0.9, p < 0.01). As a result, AUC8 increased with decreasing CLCr. The mean difference in AUC8 between NRF and mild RI was < 20%. Compared with the pooled data from NRF and mild RI groups, mean AUC8 increased approximately 140% in moderate RI, 240% in severe RI, and 360% in ESRD (off dialysis). There was no correlation between Cmax or Tmax and CLCr. Approximately 10% of the dose was recovered in the dialysate of subjects with ESRD. Protein binding of lenalidomide was not markedly affected by RI (∼35 - 44%). The drug was well tolerated. On the basis of these data, recommendations for initial starting doses were made ( Table below). Conclusions: Lenalidomide dosage adjustment should be considered for patients with CLCr < 50 mL/min. [Table: see text] No significant financial relationships to disclose.
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Lau H, Loong F, Yuen WK, Patil NG. Management of herniated retroperitoneal adipose tissue during endoscopic extraperitoneal inguinal hernioplasty. Surg Endosc 2007; 21:1612-6. [PMID: 17762958 DOI: 10.1007/s00464-007-9205-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2006] [Accepted: 12/12/2006] [Indexed: 10/23/2022]
Abstract
BACKGROUND Herniation of retroperitoneal adipose tissue into the inguinal canal, traditionally called cord lipoma, is frequently encountered during endoscopic totally extraperitoneal inguinal hernioplasty (TEP). Failure to recognize and manage the cord lipoma accounted for 30%-50% of recurrent hernia after TEP. The present study was undertaken to evaluate the incidence, risk factors, and management of herniated retroperitoneal adipose tissue during TEP. METHODS Between December 2002 and November 2005 all patients who underwent TEP were prospectively evaluated for the presence of cord lipoma. Clinical outcomes of patients who were treated for their cord lipoma were compared with those without cord lipoma. Risk factors for the occurrence of cord lipoma were also examined. RESULTS A total of 498 patients underwent unilateral (n = 386) or bilateral (n = 112) TEP. The overall incidence of cord lipoma was 26.5% (n = 132). A higher body weight, a higher body mass index, and a larger hernial defect were significantly associated with the presence of cord lipoma. Most of the cord lipoma cases (n = 119) were reduced to pelvic peritoneal reflection line after division of the feeding vessels from surrounding structures, while the rest (n = 13) were resected. Early postoperative outcomes, including pain score, morbidities, and other recovery variables, showed no significant difference between the two groups. No recurrence occurred in the present series. CONCLUSIONS Herniation of retroperitoneal adipose tissue into the inguinal canal occurred in more than one-fifth of the patients with inguinal hernia. Awareness and appropriate treatment of the cord lipoma helped to reduce the risk of recurrence. During TEP, the internal inguinal ring and inguinal canal should always be cleared of any herniated adipose tissue by either reduction or resection. This clearing posed no adverse effects on postoperative outcome.
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Wan SH, Lau H, Patil NG, Lo WK, Lui SL. Peritoneal computed tomography: a diagnostic tool for genital oedema in patients on peritoneal dialysis. Hong Kong Med J 2007; 13:82-3. [PMID: 17277399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023] Open
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Abdullah F, Arnold MA, Nabaweesi R, Fischer AC, Colombani PM, Anderson KD, Lau H, Chang DC. Gastroschisis in the United States 1988-2003: analysis and risk categorization of 4344 patients. J Perinatol 2007; 27:50-5. [PMID: 17036030 DOI: 10.1038/sj.jp.7211616] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE Gastroschisis is a rare congenital abdominal wall defect through which intraabdominal organs herniate and it requires surgical management soon after birth. The objectives of this study were to profile patient characteristics of this anomaly utilizing data from two large national databases and to validate previous risk stratification categories of infants born with this condition. METHODS An analysis was performed using 13 years of the National Inpatient Sample database (1988-1996, 1998, 1999, 2001, 2002) and 3 years of the Kids' Inpatient Database (1997, 2000, 2003). These combined databases contain information from nearly 93 million discharges in the United States. Infants with gastroschisis were identified by International Classification of Disease-9 procedure code 54.71 (repair of gastroschisis) and an age at admission of <8 days. Variables of gender, race, geographic region, co-existing diagnoses, length of stay, hospital charges adjusted to 2005 dollars, complications and inpatient mortality were collected from the databases. Infants were divided into simple and complex categories based on the absence or presence of intestinal atresia, stenosis, perforation, necrosis or volvulus. Comparisons between groups were performed using Pearson's chi (2) for categorical outcomes and the Kruskal-Wallis test for non-normally distributed continuous variables. RESULTS A total of 4344 infants with gastroschisis were identified. These were comprised of 44.0% female infants (n=1910), 46.4% male infants (n=2017) whereas 9.6% were not reported (n=415). Racial analysis showed the largest subset being white in 40.9% of infants (n=1775) with Hispanic infants being the next highest group reported at 17.2% (n=745). Co-existing intestinal anomalies were the most common, affecting 9.9% (n=429) infants, whereas certain cardiac (6.8%, n=294) and pulmonary (1.7%, n=72) conditions were also identified. Simple gastroschisis represented 89.1% (n=3870) of the group whereas 10.9% (n=474) were complex in nature. Simple and complex patients differed in median length of stay (28 vs 67 days, P<0.01), inpatient mortality (2.9 vs 8.7%, P<0.01) and median inflation-adjusted hospital charges (90,788 dollars vs 197,871 dollars, P<0.01). CONCLUSIONS These data represent a national analysis of the largest group of infants with gastroschisis to date which further aids the characterization and understanding of this serious congenital condition.
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Pudney D, Lau H, MacKinnon J, Skarsgard D, Craighead P. 234 The palliative management of advanced head and neck cancer: A retrospective review. Radiother Oncol 2006. [DOI: 10.1016/s0167-8140(06)80975-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Taylor M, Wolfe N, Lau H, Hayashi R. 167 Time is money: A comparative time and motion study of intensity modulated radiation therapy versus three dimensional conformal radiation therapy for head and neck cancer. Radiother Oncol 2006. [DOI: 10.1016/s0167-8140(06)80908-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Lim G, Lau H. 112 Factors influencing late rectal toxicity after radiotherapy of localized prostate cancer. Radiother Oncol 2006. [DOI: 10.1016/s0167-8140(06)80853-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Pudney D, Lau H, Ruether D. 225 Clinical experience of the multimodality management of anaplastic thyroid cancer. Radiother Oncol 2006. [DOI: 10.1016/s0167-8140(06)80966-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ploquin N, Kay I, Rangel-Baltazar A, Lau H, Dunscombe P, Baker T. Po-Thur Eve General-02: Set-up error simulations for head and neck IMRT. Med Phys 2006. [DOI: 10.1118/1.2244629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Ploquin N, Lau H, Dunscombe P. Intensity modulated and three-dimensional conformal radiation therapy plans for oropharyngeal cancer: a comparison of their sensitivity to set-up errors and uncertainties. Curr Oncol 2006; 13:61-6. [PMID: 17576443 PMCID: PMC1891170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We compared the effect of set-up error and uncertainty on two radiation therapy treatment plans for head and neck cancer: one using intensity modulated radiation therapy (IMRT) and one using conventional three-dimensional conformal radiation therapy (3D-CRT). We used a Pinnacle3 (Philips Medical Systems, Markham, Ontario) system to create the two treatment plans (7-beam IMRT and 5-beam 3D-CRT) for the same volumetric data set, based on the objectives and constraints defined in the Radiation Therapy Oncology Group H-0022 protocol. In both plans, the dose-volume constraints for the targets and the organs at risk (oars) were met as closely as the beam geometries would allow. Monte Carlo-based simulations of set-up error and uncertainty were performed in three orthogonal directions for 840 simulated "courses of treatment" for each plan. A systematic error (chosen from distributions characterized by standard deviations ranging from 0 mm to 6 mm) and random uncertainties (2 mm standard deviation) were incorporated. We used a probability approach to compare the sensitivities of the IMRT and the 3D-CRT plans to set-up error and uncertainty in terms of equivalent uniform dose (EUD) to targets and oars.Based on the EUD analysis, the targets and oars showed considerably greater sensitivity to set-up error with the IMRT plan than with the 3D-CRT plan. For the IMRT plan, target EUDS were reduced by 4%, 7.5%, and 10% for 2-mm, 4-mm, and 6-mm set-up errors respectively. However, even with set-up error, the mandible, spinal cord, and parotid EUDS always remained lower with the IMRT plan than with the 3D-CRT plan.We conclude that, when quantified by EUD, IMRT-plan doses to oars and targets are more sensitive to set-up error than are 3D-CRT-plan doses. However, as judged by the differences between target and OAR doses, IMRT retains its superiority over 3D-CRT, even in the presence of set-up error.
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