Nurjanah, R., P. Dwipoerwantoro, and D. Darwis. “Seroepidemiology of Helicobacter Pylori in Primary School Students in Krotek, Cibeber Village, Serang District, Banten, Indonesia”. Paediatrica Indonesiana, Vol. 49, no. 5, Oct. 2009, pp. 264-9, doi:10.14238/pi49.5.2009.264-9.