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de Haan L, de Haan HA, Olivier B, Verster JC.de Haan L, et al. Among authors: verster jc.Int J Gen Med. 2012;5:889-98. doi: 10.2147/IJGM.S37401. Epub 2012 Oct 19.Int J Gen Med. 2012.PMID: 23118547Free PMC article.