Saad, F
Yassin, A
Doros, G
Haider, A
Article History
Received: 24 April 2015
Revised: 23 June 2015
Accepted: 2 July 2015
First Online: 29 July 2015
Competing interests
: FS is a full-time employee of Bayer Pharma; AY and AH have received partial compensation for data entry from Bayer Pharma; GD has received payment for statistical analyses from Bayer Pharma.