Bull, Jonathan R. http://orcid.org/0000-0001-9992-3769
Rowland, Simon P.
Scherwitzl, Elina Berglund
Scherwitzl, Raoul
Danielsson, Kristina Gemzell
Harper, Joyce
Funding for this research was provided by:
Full time employee of Natural Cycles Nordic AB
Article History
Received: 4 March 2019
Accepted: 17 July 2019
First Online: 27 August 2019
Competing interests
: The study was funded by Natural Cycles Nordic AB. J.R. Bull and S.P. Rowland are full time employees of Natural Cycles Nordic AB. E. Berglund Scherwitzl and R. Scherwitzl are the founders of Natural Cycles Nordic AB. J. Harper has received consultancy fees from Natural Cycles to compensate for her expert input on this paper.