Sallis, James F, Cerin, Ester, Conway, Terry L, Adams, Marc A, Frank, Lawrence D, Pratt, Michael, Salvo, Deborah, Schipperijn, Jasper, SMITH, Graham, Cain, Kelli L, Davey, Rachel, Kerr, Jacqueline, Lai, Poh-Chin, Mitáš, Josef, Reis, Rodrigo, Sarmiento, Olga L, Schofield, Grant, Troelsen, Jens, Van Dyck, Delfien, De Bourdeaudhuij, Ilse and Owen, Neville (2016) Physical activity in relation to urban environments in 14 cities worldwide: a cross-sectional study. The Lancet, 387 (10034). pp. 2207-2217. ISSN 01406736