Department of Medicine, School of Medical Sciences, University Sains Malaysia, Kubang Kerian 16150, Malaysia
Department of Gastroenterology, Sunway Medical Center, Petaling Jaya 46150, Malaysia
31 Lebuh Raya Raman Ipoh, Ipoh Garden South, Ipoh 31400, Malaysia
Center for Functional Gastrointestinal and Motility Disorders, University of North Carolina at Chapel Hill, Chapel Hill, CA 27599-7080, United States
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