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. Author manuscript; available in PMC: 2012 Feb 13.
Published in final edited form as: J Clin Epidemiol. 2008 Jul 10;61(11):1132–1143. doi: 10.1016/j.jclinepi.2007.12.009
YES...........................1
NO............................5 GO TO *FD12
DON’T KNOW........8 GO TO *FD12
REFUSED.................9 GO TO *FD12