PubMed:: "Oocyte Retrieval"[Mesh] OR egg retrieval[tiab] OR oocyte harvest[tiab] OR oocyte recovery[tiab] OR oocyte retrieval[tiab] OR oocyte collection[tiab] OR oocyte aspiration[tiab];; Embase.com:: 'oocyte retrieval'/exp OR 'egg retrieval':ab,ti OR 'oocyte harvest':ab,ti OR 'oocyte recovery':ab,ti OR 'oocyte retrieval':ab,ti OR 'oocyte collection':ab,ti OR 'oocyte aspiration':ab,ti;; Cochrane Library:: "egg retrieval" OR "oocyte harvest" OR "oocyte recovery" OR "oocyte retrieval" OR "oocyte collection" OR "oocyte aspiration":ti,ab,kw