Heritable components of the human fecal microbiome are associated with visceral fat by Beaumont, M, Goodrich, J, Jackson, M, Yet, I, Davenport, E, Vieira-Silva, S, Debelius, J, Pallister, T, Mangino, M, Raes, J, Knight, R, Clark, A, Ley, R, Spector, T, Bell, J