title: Commentary: Two-sample Mendelian randomization: opportunities and challenges.
authors.affiliation: MRC Integrative Epidemiology Unit at the University of Bristol and School of Social and Community Medicine, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK. d.a.lawlor@bristol.ac.uk.
authors.forename: Debbie A
authors.initials: DA
authors.lastname: Lawlor
mesh_terms: D005838:Genotype; D006801:Humans; D057182:Mendelian Randomization Analysis; D011897:Random Allocation