IVF or IUI as first-line treatment in unexplained subfertility: The conundrum of treatment selection markers

R. I. Tjon-Kon-Fat^*, P. Tajik, M. H. Zafarmand, A. J. Bensdorp, P. M.M. Bossuyt, G. J.E. Oosterhuis, R. Van Golde, S. Repping, M. D.A. Lambers, E. Slappendel, D. Perquin, M. J. Pelinck, J. Gianotten, J. W.M. Maas, M. J.C. Eijkemans, F. Van Der Veen, B. W. Mol, M. Van Wely

^*Corresponding author for this work