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Nieveen van Dijkum EJ, de Wit LT, van Delden OM, Kruyt PM, van Lanschot JJ, Rauws EA, Obertop H, Gouma DJ.Nieveen van Dijkum EJ, et al. Among authors: obertop h.J Am Coll Surg. 1999 Nov;189(5):459-65. doi: 10.1016/s1072-7515(99)00186-6.J Am Coll Surg. 1999.PMID: 10549734