No external funds were obtained for this study. S.C.O, T.C.v.T., O.H., H.L.T., E.G.W.M.L., C.B.L. and M.J.C.E. have nothing to disclose. F.J.M.B. receives monetary compensation: member of the external advisory board for Merck Serono and Ferring, the Netherlands; educational activities for Ferring BV, the Netherlands; consultancy work for Gedeon Richter, Belgium; strategic cooperation with Roche on automated AMH assay development and research cooperation with Ansh Labs.
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