Vaginal progesterone as luteal phase support in natural cycle frozen-thawed embryo transfer (ProFET): protocol for a multicentre, open-label, randomised controlled trial by Kenny A Rodriguez-Wallberg, Christina Bergh, Ali Khatibi, Annika Strandell, Mats Brännström, Caroline Stadelmann, Kristbjörg Heiður Olsen, Margareta Kitlinski, Susanne Liffner, Eva Lundborg, Göran Westlander, Gabriella Widlund, Åsa Magnusson

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