Xi Bo, Hao Yongchen, Liu Fangchao
Department of Maternal and Child Health, School of Public Health, Shandong University, Jinan 250012, China.
Department of Epidemiology, Capital Medical University Beijing Anzhen Hospital, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.
Lancet. 2014 Mar 29;383(9923):1128. doi: 10.1016/S0140-6736(14)60567-5.