Caffeine for the Pharmacological Treatment of Apnea of Prematurity in the NICU: Dose Selection Conundrum, Therapeutic Drug Monitoring and Genetic Factors - Jia-Yi Long; Hong-Li Guo; Xin He; Ya-Hui Hu; Ying Xia; Rui Cheng; Xuan-Sheng Ding; Feng Chen; Jing Xu (Frontiers in Pharmacology, 2021)