Burgess S, Thompson SG, Burgess S, Thompson SG, Andrews G, Samani NJ, Hall A, Whincup P, Morris R, Lawlor DA, et al. Bayesian methods for meta-analysis of causal relationships estimated using genetic instrumental variables. Stat Med. 2010  ;29(12):1298-311.

Sarwar N, Gao P, Seshasai SRKondapal, Gobin R, Kaptoge S, Di Angelantonio E, Ingelsson E, Lawlor DA, Selvin E, Stampfer M, et al. Diabetes mellitus, fasting blood glucose concentration, and risk of vascular disease: a collaborative meta-analysis of 102 prospective studies. Lancet. 2010  ;375(9733):2215-22.