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van der Valk M, Allick G, Weverling GJ, Romijn JA, Ackermans MT, Lange JM, van Eck-Smit BL, van Kuijk C, Endert E, Sauerwein HP, Reiss P.van der Valk M, et al. Among authors: romijn ja.J Clin Endocrinol Metab. 2004 Jul;89(7):3554-60. doi: 10.1210/jc.2003-030985.J Clin Endocrinol Metab. 2004.PMID: 15240645Clinical Trial.