Department of Child Health Care, Childrens Hospital of Nanjing Medical University, Nanjing, China. Department of Children Health Care, Childrens Hospital of Fudan University, Shanghai, China. Department of Pediatrics, Beijing University Third Hospital, Bejing, China. Arla Innovation Center, Arla Foods amba, Skejby, Denmark. Arla Foods Ingredients Group P/S, Viby, Denmark. Department of Clinical Sciences, Pediatrics, Umeå University, Umeå, Sweden. Departments of Public Health and Clinical Medicine, Epidemiology and Global Health, Umeå University, Umeå, Sweden. Department of Nutrition, University of California, Davis, California, United States of America.