Multi-Trait Analysis of GWAS and Biological Insights Into Cognition: A Response to Hill (2018) - Lam, Max; Trampush, Joey W; Yu, Jin; Knowles, Emma; Djurovic, Srdjan; Melle, Ingrid; Sundet, Kjetil; Christoforou, Andrea; Reinvang, Ivar; DeRosse, Pamela; others (Twin Research and Human Genetics, 2018)