China's Left-Behind Children: Impact Of Parental Migration On Health, Nutrition, And Educational Outcomes - Chengchao Zhou; Sean Sylvia; Zhang*, Linxiu; Rennfu Luo; Hongmei Yi; Chengfang Liu; Yaojiang Shi; Prashant Loyalka; Chu, James; Alexis Medina; Scott Rozelle (Health Affairs, 2015)