[1] Univ Queensland, Sch Social Sci, St Lucia, Qld 4072, Australia
[2] Liverpool John Moores Univ, Publ Hlth Inst, Henry Cotton Campus,15-21 Webster St, Liverpool L3 2ET, Merseyside, England
[3] Scottish Natl Blood Transfus Serv, Res Dev & Innovat, Edinburgh, Midlothian, Scotland
[4] Publ Hlth Wales, Hlth Promot, Cardiff, S Glam, Wales