Zein, A.F.M.Z., Department of Internal Medicine, Faculty of Medicine, Universitas Swadaya Gunung Jati-Waled General Hospital, Jalan Taman Pemuda 2 Kompleks Stadion Bima, Kesambi, Kota Cirebon, West Java, 45132, Indonesia; Pribadi, R.R., Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, Universitas Indonesia-Cipto Mangunkusumo National General Hospital, Jakarta, Indonesia; Khasanah, U., Department of Biostatistics and Epidemiology, Faculty of Medicine, Universitas Swadaya Gunung Jati, Cirebon, Indonesia; Bestari, M.B., Division of Gastroenterohepatology, Department of Internal Medicine, Faculty of Medicine, Universitas Padjadjaran-Hasan Sadikin Hospital, Bandung, Indonesia; Syam, A.F., Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, Universitas Indonesia-Cipto Mangunkusumo National General Hospital, Jakarta, Indonesia