International Physical Activity and Built Environment Study of adolescents: IPEN Adolescent design, protocol and measures by Ranjit Mohan Anjana, Adewale L Oyeyemi, Ester Cerin, Rodrigo Reis, James F Sallis, Kelli L Cain, Terry L Conway, Anna Timperio, Jo Salmon, Anthony Barnett, Jasper Schipperijn, Lawrence D Frank, Erica Hinckson, Tanja Schmidt, Delfien Van Dyck, Jan Dygrýn, Josef Mitáš, Mohammed Zakiul Islam, Javier Molina-García, Mika Moran, Wan Abdul Manan Wan Muda, Maria Paula Santos, Grant M Schofield

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