Sungkar, Ali, Adly N.A. Fattah, Raymond Surya, Budi I. Santoso, and Ivica Zalud. 2017. “High Preterm Birth at Cipto Mangunkusumo Hospital As a National Referral Hospital in Indonesia”. Medical Journal of Indonesia 26 (3), 198-203. https://doi.org/10.13181/mji.v26i3.1454.