L. M Lotrean, S Kremers, C Ionut and H. de Vries
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L. M Lotrean, F Dijk, I Mesters, C Ionut and H. De Vries
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I Elfeddali, C Bolman, I Mesters, R. W Wiers and H. de Vries
Health Education Research 25 ( 6 ): 1008 - 1020 , 2010