S van der Geer, H. A Reijers, H. F. J. M van Tuijl, H de Vries and G. A. M. Krekels
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S Dlamini, M Taylor, N Mkhize, R Huver, R Sathiparsad, H de Vries, K Naidoo and C. Jinabhai
Health Education Research 24 ( 3 ): 450 - 460 , 2009
M. M van Stralen, L Lechner, A. N Mudde, H de Vries and C. Bolman
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