Blomström, Å
Gardner, R M
Dalman, C
Yolken, R H
Karlsson, H
Article History
Received: 14 October 2014
Accepted: 24 November 2014
First Online: 3 February 2015
Competing interests
: Dr Yolken received grants from the Stanley Medical Research Institute during the conduct of the study. The remaining authors declare no conflict of interest.