Tanjung, Fahrul Azmi, Supriatmo Supriatmo, Atan Baas Sinuhaji, and Hakimi Hakimi. 2013. “Functional Constipation and Posture in Defecation”. Paediatrica Indonesiana 53 (2):104-7. https://doi.org/10.14238/pi53.2.2013.104-7.