Sebayang, Taheng, Atan Sinuhaji, Tyahaya Bangun, Manihar Marbun, and A. Sutanto. 2019. “The Spectrum of Gastroenteritis at the Pediatric Outpatient Clinic,. Department of Child Health, School of Medicine, University of North Sumatera in 1982”. Paediatrica Indonesiana 28 (1-2), 1-13. https://doi.org/10.14238/pi28.1-2.1988.1-13.