title: Letter to the editor.
authors.affiliation: Dept. Obstetrics & Gynaecology, Jan Ypermansziekenhuis, Briekestraat 12, 8900 Ieper, Belgium.
authors.forename: G
authors.initials: G
authors.lastname: Page
references.citation: J Clin Epidemiol. 2008 Jan;61(1):64-75
references.pmid: 18083463
references.citation: Fertil Steril. 2010 Oct;94(5):1647-51
references.pmid: 20056216
references.citation: Facts Views Vis Obgyn. 2013;5(3):233-40
references.pmid: 24753948
references.citation: J Clin Epidemiol. 1995 Jan;48(1):45-57; discussion 59-60
references.pmid: 7853047