1 Gastroenterology Service, Department of Internal Medicine, Walter Reed National Military Medical Center, Bethesda, Maryland; Uniformed Services University of Health Sciences, Bethesda, Maryland.
2 University Clinic of Gastroenterohepatology, Skopje, Macedonia.
3 Gastroenterology Service, Department of Internal Medicine, Walter Reed National Military Medical Center, Bethesda, Maryland; Uniformed Services University of Health Sciences, Bethesda, Maryland. Electronic address: peyoungmd@gmail.com.