ZHANG Yajing, WEI Jianhe, QU Haixin, YUAN Erwei, XU Jinli, WANG Lingling. Clinical research of nasal intermittent positive pressure ventilation combined with caffeine on the prevention and treatment of premature infants with extubation failureJ. Journal of Clinical Medicine in Practice, 2018, (1): 122-124. DOI: 10.7619/jcmp.201801038