Tobias, D K
Zhang, C
Chavarro, J
Olsen, S
Bao, W
Bjerregaard, A A
Fung, T T
Manson, J E
Hu, F B
Article History
Received: 17 May 2016
Revised: 21 July 2016
Accepted: 29 July 2016
First Online: 29 August 2016
Competing interests
: The authors declare no conflict of interest.