Forest plots generated from the results of six MR techniques (a-f). Abbreviations are as follows: T1D, type 1 diabetes; T2D, type 2 diabetes; CAD, coronary artery disease; RA, rheumatoid arthritis; IBD, inflammatory bowel disease; VitD, vitamin D (25OHD); BMI, body mass index; Smoke, cigarettes per day; Drink, drinks per week; p, p-value; OR, odds ratio.