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Vrijens B, Belmans A, Matthys K, de Klerk E, Lesaffre E.Vrijens B, et al. Among authors: de klerk e.Pharmacoepidemiol Drug Saf. 2006 Feb;15(2):115-21. doi: 10.1002/pds.1198.Pharmacoepidemiol Drug Saf. 2006.PMID: 16342302Clinical Trial.
Lesaffre E, de Klerk E.Lesaffre E, et al. Among authors: de klerk e.Control Clin Trials. 2000 Dec;21(6):540-51. doi: 10.1016/s0197-2456(00)00088-x.Control Clin Trials. 2000.PMID: 11146148
Vrijens B, Goetghebeur E, de Klerk E, Rode R, Mayer S, Urquhart J.Vrijens B, et al. Among authors: de klerk e.Stat Med. 2005 Sep 15;24(17):2719-31. doi: 10.1002/sim.2130.Stat Med. 2005.PMID: 16118813
Urquhart J, De Klerk E.Urquhart J, et al. Among authors: de klerk e.Stat Med. 1998 Feb 15;17(3):251-67; discussion 387-9. doi: 10.1002/(sici)1097-0258(19980215)17:3<251::aid-sim762>3.0.co;2-a.Stat Med. 1998.PMID: 9493254
de Klerk E, van der Heijde D, Landewé R, van der Tempel H, Urquhart J, van der Linden S.de Klerk E, et al.J Rheumatol. 2003 Jan;30(1):44-54.J Rheumatol. 2003.PMID: 12508389
de Klerk E, van der Linden S, van der Heijde D, Urquhart J.de Klerk E, et al.Stat Med. 1997 Jul 30;16(14):1653-64. doi: 10.1002/(sici)1097-0258(19970730)16:14<1653::aid-sim591>3.0.co;2-#.Stat Med. 1997.PMID: 9257419Clinical Trial.
de Klerk E, van der Heijde D, Landewé R, van der Tempel H, van der Linden S.de Klerk E, et al.J Rheumatol. 2003 Nov;30(11):2469-75.J Rheumatol. 2003.PMID: 14677194
de Klerk E, van der Linden SJ.de Klerk E, et al.Br J Rheumatol. 1996 Jan;35(1):60-5. doi: 10.1093/rheumatology/35.1.60.Br J Rheumatol. 1996.PMID: 8624625Clinical Trial.
Claxton A, de Klerk E, Parry M, Robinson JM, Schmidt ME.Claxton A, et al. Among authors: de klerk e.J Clin Psychiatry. 2000 Dec;61(12):928-32. doi: 10.4088/jcp.v61n1207.J Clin Psychiatry. 2000.PMID: 11206598Clinical Trial.