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Hak E, van Essen GA, Stalman WA, de Melker RA.Hak E, et al. Among authors: de melker ra.Fam Pract. 1998 Apr;15(2):138-43. doi: 10.1093/fampra/15.2.138.Fam Pract. 1998.PMID: 9613481
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