GNRH1 and ovarian hyperstimulation syndrome: A recentcost-effectiveness analysis comparing GnRH-agonist and GnRH-antagonist COSin the general IVF population by Jing et al. found that theGnRH-antagonist protocol is economically advantageous per fresh embryocycles due to the shorter treatment duration, lower gonadotrophin doserequired and lower incidence of OHSS.