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• The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2318/14/6/prepub

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1. 1Australian cohort; 2Chinese cohort; 3the tests were undertaken for survey data only; 4 Objective burden: Level 1 analyses in Giddens’ Structuration Theory Framework; see Additional file 2 that shows the integration of the objective burden into the findings.