1. Global physical activity levels: surveillance progress, pitfalls, and prospects;PC Hallal;Lancet,2012
2. Sedentary time and physical activity surveillance through accelerometer pooling in four European countries;A Loyen;Sports Med,2016
3. World Health Organization. Global recommendations on physical activity for health. 2010. Available from: http://apps.who.int/iris/bitstream/10665/44399/1/9789241599979_eng.pdf. Cited 27 June 2017.
4. The Norwegian Directorate of Health. Recommendations on diet, nutrition and physical activity. The Norwegian Directorate of Health, Oslo. 2014. Available from: https://helsedirektoratet.no/Lists/Publikasjoner/Attachments/806/Anbefalinger-om-kosthold-ernering-og-fysisk-aktivitet-IS-2170.pdf. Cited 14 May 2017.
5. Is active travel associated with greater physical activity? The contribution of commuting and non-commuting active travel to total physical activity in adults;S Sahlqvist;Prev Med,2012