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Welberg JW, Kleibeuker JH, Van der Meer R, Kuipers F, Cats A, Van Rijsbergen H, Termont DS, Boersma-van Ek W, Vonk RJ, Mulder NH, et al.Welberg JW, et al. Among authors: vonk rj.Eur J Clin Invest. 1993 Jan;23(1):63-8. doi: 10.1111/j.1365-2362.1993.tb00719.x.Eur J Clin Invest. 1993.PMID: 8444275