Hornig, M http://orcid.org/0000-0001-7572-3092
Bresnahan, M A
Che, X
Schultz, A F
Ukaigwe, J E
Eddy, M L
Hirtz, D
Gunnes, N
Lie, K K
Magnus, P
Mjaaland, S
Reichborn-Kjennerud, T
Schjølberg, S
Øyen, A-S
Levin, B
Susser, E S
Stoltenberg, C
Lipkin, W I
Article History
Received: 25 April 2016
Revised: 24 March 2017
Accepted: 19 April 2017
First Online: 13 June 2017
Competing interests
: The authors declare no conflict of interest.