Gillespie, Nathan A.; Aggen, Steven H.; Neale, Michael C.; Knudsen, Gun Peggy S.; Krueger, Robert F.; South, Susan C.; Czajkowski, Nikolai Olavi; Nesvåg, Ragnar; Ystrøm, Eivind; Kendler, Kenneth S.; Reichborn-Kjennerud, Ted (Peer reviewed; Journal article, 2018)