Achara S, Adeyemi B, Dosekun E, Kelleher S, Lansley M, Male I, Muhialdin N, Reynolds L, Roberts I, Smailbegovic M, van der Spek N
Department of Paediatric Epidemiology and Biostatics, Institute of Child Health, WC1N 1EH, London, UK
Lancet. 2001 Jul 21;358(9277):230-2. doi: 10.1016/S0140-6736(01)05416-2.