Garaiova, I
Muchová, J
Nagyová, Z
Wang, D
Li, J V
Országhová, Z
Michael, D R
Plummer, S F
Ďuračková, Z
Article History
Received: 20 February 2014
Revised: 1 July 2014
Accepted: 1 August 2014
First Online: 10 September 2014
Competing interests
: The study was sponsored by Cultech Ltd, UK. IG, DRM and SFP are employees of Cultech Ltd and had no role in the recruitment, data collection and analysis. The remaining authors declare no conflict of interest.