Not only randomised controlled trials, but also controlled observational studies

Author(s):
Helmerhorst, F.M.
Published
2014
Publication type
Article / Letter to editor
Date issued
2014-02-28
Language
English
Is part of
European Journal of Contraception and Reproductive Health Care (2014), Vol. 19, no. 1, p. 71-+
hdl
1887/103843
doi
10.3109/13625187.2013.871251