[1] Cegyr Eugin Grp, Reprod Med, Buenos Aires, Argentina
[2] Ctr Infertilidad Reprod Humana CIRH, Eugin Grp, Reprod Dept Med, Barcelona, Spain
[3] Hosp Italiano Buenos Aires, Dept Reprod Med, Buenos Aires, Argentina
[4] Argentine Cochrane Ctr, Natl Sci & Tech Res Council, Ctr Res Epidemiol & Publ Health, Inst Clin Effectiveness & Hlth Policy IECS,CONICE, Buenos Aires, Argentina