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Pietersma-de Bruyn AL, van der Straaten PJ, van Haard PM, Kuijpers JC, Hamulyák K, Ruys JH.Pietersma-de Bruyn AL, et al. Among authors: van haard pm, van der straaten pj.Eur J Pediatr. 1990 Jun;149(9):640-4. doi: 10.1007/BF02034753.Eur J Pediatr. 1990.PMID: 2373117
van Veen LN, Heron M, Batstra M, van Haard PMM, de Groot H.van Veen LN, et al. Among authors: van haard pmm.BMC Pediatr. 2016 Jun 2;16:74. doi: 10.1186/s12887-016-0609-7.BMC Pediatr. 2016.PMID: 27255511Free PMC article.Clinical Trial.