Abdelhameed, Ali Saber
Morris, Gordon A.
Almutairi, Fahad
Adams, Gary G.
Duvivier, Pierre
Conrath, Karel
Harding, Stephen E.
Article History
Received: 1 June 2016
Accepted: 21 September 2016
First Online: 26 October 2016
Competing interests
: P.D. and K.C. are, or were at the time of the study, employees of the G.S.K. group of companies.