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Optimism during pregnancy and obstetrical outcomes: A systematic reviewGiangiordano, Ilaria; Sahani, Harshini; Di Mascio, Daniele; Saccone, Gabriele; Bellussi, Federica; Berghella, Andrea; Braverman, Andrea; Berghella, Vincenzo · European Journal of Obstetrics & Gynecology and Reproductive Biology · 2020