Behavior Genetics, 49(6), 491-492. Springer van der Zee, M, Schutte, N, Huppertz, C, Doornweerd, S, Bartels, M, de Geus, E & van der Ploeg, H 2019, ' Heritability of objectively assessed physical activity in the Netherlands ', Behavior Genetics, vol. 49, no. 6, pp. 491-492 .