Author response: low vitamin D concentrations may contribute to the increased risk of diabetes mellitus related to shift work

Correspondence to Professor Zuxun Lu, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China; [email protected]

Received October 20, 2014 October 21, 2014; accepted October 22, 2014; previously published online January November 7, 2014