Fig. 4
From: Association of vitamin D receptor gene variants with polycystic ovary syndrome: a meta-analysis
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12881-019-0763-5/MediaObjects/12881_2019_763_Fig4_HTML.png)
Sensitive analysis by omitting one study at a time to evaluate the stability of results. a VDR ApaI (rs7975232) with allelic model: C vs. A; b VDR BsmI (rs1544410) with allelic model: G vs. A