P-690 Time to bust some myths about progesterone supplementation in the luteal phase. Role of the route of administration and usefulness (or uselessness) of plasma determination by Barrenetxea Ziarrusta, G, Celis García, R, Martínez Sanz, E, De Las Heras Martínez, M, Gómez Picado, O, Aguirre Landaluce, O, Arambarri Beldarrain, J.I, Da Silva Tabuyo, A, Barrenetxea Arrinda, J

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