A new more detailed stratification of low responders to ovarian stimulation: from a poor ovarian response to a low prognosis concept.

Poseidon Group (Patient-Oriented Strategies Encompassing IndividualizeD Oocyte Number), Alviggi C, Andersen CY, Buehler K, Conforti A, De Placido G, Esteves SC, Fischer R, Galliano D, Polyzos NP, Sunkara SK,  Ubaldi FM, Humaidan P