PMID 21422850. doi:10.1097/AOG.0b013e3182116bc8. ↑ RESOLVE : The National Infertility Association ↑ "Section: Age, Timing of Decline" (PDF). ↑ (PDF) http://dl.dropbox.com/u/8256710/ASRM_Age.pdf. Missing or empty |title= (help)