前言例 a P Haggarty, Effect of B vitamins and genetics on success of in-vitro fertilisation: respective cohort study ■ ancet2006:367:1513-19前言例 ◼ P Haggarty, ◼ Effect of B vitamins and genetics on success of in-vitro fertilisation: rospective cohort study ◼ Lancet 2006; 367: 1513–19