Effectiveness of a smartphone app on improving immunization of children in rural Sichuan Province, China: a cluster randomized controlled trial by Li Chen, Xiaozhen Du, Lin Zhang, Michelle Helena van Velthoven, Qiong Wu, Ruikan Yang, Ying Cao, Wei Wang, Lihui Xie, Xiuqin Rao, Yanfeng Zhang, Jeanne Catherine Koepsell

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