?:definition
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The Work Productivity and Activity Impairment - Specific Health Problems Questionnaire Version 2.0 (WPAI-SHP V2.0) (Reilly MC, Zbrozek AS, Dukes EM. The validity and reproducibility of a work productivity and activity impairment instrument. PharmacoEconomics 1993; 4(5):353-65. http://www.reillyassociates.net/WPAI_SHP.html. http://www.reillyassociates.net/WPAI_General.html).
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