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History
- July 24, 2017.
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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
Author Information
- 1Departments of Nutrition and Food Hygiene, and School of Public Health, Shandong University
- 2Departments of Maternal and Child Health Care, School of Public Health, Shandong University
- 3Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, IA, 52242,USA
- ↵Correspondence to: Professor Xia Wang, Department of Maternal and Child Health Care, School of Public Health, Shandong University, 44 Wenhuaxi Road, Jinan, Shandong 250012, P.R. China E-mail: wangxiaes{at}sdu.edu.cn
* Contributed equally