Survival outcomes among periviable infants: a systematic review and meta-analysis comparing different income countries and time periods - Li, Ying Xin; Hu, Yan Ling; Huang, Xi; Li, Jie; Li, Xia; Shi, Ze Yao; Yang, Ru; Zhang, Xiujuan; Li, Yuan; Chen, Qiong (Frontiers in Public Health, 2024)