Darnindro, Nikko, Ari F Syam, Achmad Fauzi, and Cleopas M Rumende. 2015. “Seroprevalence and Socio-Demographic Factors of Helicobacter Pylori Infection in Patients With Dyspepsia in Kalibaru Primary Health Care North Jakarta”. Acta Medica Indonesiana 47 (4). http://www.actamedindones.org/index.php/ijim/article/view/21.