Liu, Aijun, Ming Yang, Xiangming Fan, Bin Li, and Junwu Su. “Application of Left Axillary Incision in Patent Ductus Arteriosus Ligation”. The Heart Surgery Forum 24, no. 1 (January 20, 2021): E055-E059. Accessed March 3, 2021. https://journal.hsforum.com/index.php/HSF/article/view/3419.