Colak, Ruya, Senem Alkan Ozdemir, Ezgi Yangin Ergon, Ferit Kulali, Oguz Han Kalkanli, Tulin Gokmen Yildirim, Murat Muhtar Yilmazer, Cuneyt Zihni, and Sebnem Calkavur. “Should Echocardiographic Evaluation Be Performed Routinely in the First 72 Hours in Extremely Low Birth Weight Babies?”. Gynecology Obstetrics & Reproductive Medicine 27, no. 2 (August 2, 2021): 175–180. Accessed January 20, 2022. https://gorm.com.tr/index.php/GORM/article/view/1168.