DOI:
10.1055/s-00000031
Klinische Monatsblätter für Augenheilkunde
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References
Guthold R, Ono T, Strong KL. et al.
Worldwide variability in physical inactivity a 51-country survey.
Am J Prev Med 2008;
34: 486-494
doi:10.1016/j.amepre.2008.02.013
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