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Early \u03b2-hCG levels predict live birth after single embryo transfer. J Assist Reprod Genet, <b>39<\/b> : 2355-2364, 2022.","DOI":"10.1007\/s10815-022-02606-w"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Valdera Simbr\u00f3n CJ, Hern\u00e1ndez Rodr\u00edguez C, Llanos Jim\u00e9nez L, P\u00e9rez Garc\u00eda L, Plaza Arranz J, Albi Gonz\u00e1lez M. Management of early gestations with low beta-human chorionic gonadotropin conceived by assisted reproductive technologies : performance of M4 predictive model. Ultrasound Obstet Gynecol, <b>58<\/b> : 616-624, 2021.","DOI":"10.1002\/uog.23625"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Mackens S, Santos-Ribeiro S, van de Vijver A, <i>et al.<\/i> Frozen embryo transfer : a review on the optimal endometrial preparation and timing. Hum Reprod, <b>32<\/b> : 2234-2242, 2017.","DOI":"10.1093\/humrep\/dex285"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Gardner DK, Schoolcraft WB. 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