1. Proteomics Platform, CIC bioGUNE, CIBERehd, ProteoRed, Technology Park of Bizkaia, Derio, Spain, Proteomika S.L. Technology Park of Bizkaia, Derio, Spain, Instituto Valenciano de Infertilidad, Madrid, Spain, Hospital de Cruces, Barakaldo, Spain, and Instituto Valenciano de Infertilidad, Bilbao, Spain