title: Author response.
authors.affiliation: Behavioural Epidemiology, Baker IDI Heart and Diabetes Institute, Melbourne, Australia. Electronic address: neville.owen@bakeridi.edu.au.
authors.forename: Takemi
authors.initials: T
authors.lastname: Sugiyama
authors.affiliation: Behavioural Epidemiology, Baker IDI Heart and Diabetes Institute, Melbourne, Australia.
authors.forename: Neville
authors.initials: N
authors.lastname: Owen
authors.affiliation: Prevention Research Collaboration, Sydney School of Public Health, University of Sydney, Camperdown, NSW, Australia.
authors.forename: Ding
authors.initials: D
authors.lastname: Ding
mesh_terms: D001334:Automobile Driving; D005260:Female; D006801:Humans; D007899:Leisure Activities; D008297:Male; D009043:Motor Activity; D015430:Weight Gain