Azeem Majeed1, Laurence Buckman2. 1. Department of Primary Care and Public Health, Imperial College London, London W6 8RP, UK a.majeed@imperial.ac.uk l.buckman@ntlworld.com. 2. Temple Fortune Medical Group, London NW11 7TE, UK a.majeed@imperial.ac.uk l.buckman@ntlworld.com.