Using the World Health Organization Health and Work Performance Questionnaire (HPQ) to Evaluate the Indirect Workplace Costs of Illness
Ronald C. Kessler, Minnie Ames, Pamela A. Hymel, Ronald Loeppke, David K. McKenas, Dennis E. Richling
Journal of Occupational & Environmental Medicine · 2004
10.1097/01.jom.0000126683.75201.c5