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Heterophilic antibodies may be a cause of falsely low total IGF1 levels.
Brugts MP, Luermans JG, Lentjes EG, van Trooyen-van Vrouwerff NJ, van der Horst FA, Slee PH, Lamberts SW, Janssen JA. Brugts MP, et al. Among authors: van trooyen van vrouwerff nj. Eur J Endocrinol. 2009 Oct;161(4):561-5. doi: 10.1530/EJE-09-0316. Epub 2009 Jul 16. Eur J Endocrinol. 2009. PMID: 19608715
Predictive value of sperm morphology and progressively motile sperm count for pregnancy outcomes in intrauterine insemination.
Lemmens L, Kos S, Beijer C, Brinkman JW, van der Horst FA, van den Hoven L, Kieslinger DC, van Trooyen-van Vrouwerff NJ, Wolthuis A, Hendriks JC, Wetzels AM; Semen Section of the Dutch Foundation for Quality Assessment in Medical Laboratories. Lemmens L, et al. Among authors: van trooyen van vrouwerff nj. Fertil Steril. 2016 Jun;105(6):1462-8. doi: 10.1016/j.fertnstert.2016.02.012. Epub 2016 Mar 2. Fertil Steril. 2016. PMID: 26930619 Free article.