Siregar H, Rusdidjas R, Sutanto AH, Siregar Z, Loebis M. Survey on sexual maturation on freshmen at the University of North Sumatera, Medan. PI [Internet]. 30Aug.1981 [cited 14May2024];21(7-8):141-. Available from: https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/1187