Rationale and design of two prospective, multicenter, observational studies on reproductive outcome in women with recurrent failures after spontaneous or assisted conception: OTTIL... by Michela Villani, Domenico Baldini, Pasquale Totaro, Giovanni Larciprete, Mirjana Kovac, Domenico Carone, Serena Maria Passamonti, Eleonora Tamborini Permunian, Tiziana Bartolotti, Andrea Lojacono, Rossella Cacciola, Giuliano Lo Pinto, Eugenio Bucherini, Valerio De Stefano, Corrado Lodigiani, Cristina Lavopa, Yoon Sung Cho, Caterina Pizzicaroli, Donatella Colaizzo, Elvira Grandone

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