P-702 Secretion of beta-human chorionic gonadotropin (b-hCG) by post-implantation embryos differs according to different chromosomal status - Palomar, A; De la Rosa Carracedo, P; Quiñonero, A; Florensa, M; Mercader, A; Domínguez, F; Sanchez-Ribas, I (Human reproduction (Oxford), 2023)