Advanced maternal age and adverse pregnancy outcomes: A systematic review and meta-analysis Lean, Samantha C. ; Derricott, Hayley ; Jones, Rebecca L. ; Heazell, Alexander E. P. Abstract Publication: PLoS ONE Pub Date: October 2017 DOI: 10.1371/journal.pone.0186287 Bibcode: 2017PLoSO..1286287L