[1] Leeds Inst Hlth Sci, Level 10 Worsley Bldg,Clarendon Way, Leeds LS2 9NL, W Yorkshire, England
[2] Heinrich Heine Univ Dusseldorf, Med Fac, Addict Res & Clin Epidemiol Unit, Inst Gen Practice, Werdener Str 4, D-40227 Dusseldorf, Germany
[3] Orange Grove Farm, Initiat, Islamabad, Pakistan
[4] ARK Fdn, House B130,Rd 21, Dhaka 1206, Bangladesh
[5] HERD Int, POB 24144, Kathmandu 11, Nepal
[6] Univ York, Hull York Med Sch, York YO10 5DD, N Yorkshire, England