by Ference, B.A. et al.
Effect of naturally random allocation to lower low-density lipoprotein cholesterol on the risk of coronary heart disease mediated by polymorphisms in NPC1L1, HMGCR, or both: a 2 × 2 factorial Mendelian randomization study.
J. Am. Coll. Cardiol. 2015; 15:1552-61