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Health Economics > 29 > 12 > 1606 - 1619
Human Resources for Health > 2018 > 16 > 1 > 1-10
Preventive Medicine > 2009 > 49 > 2-3 > 142-147
Preventive Medicine > 2007 > 44 > 2 > 167-169
Journal of Occupational Rehabilitation > 2007 > 17 > 2 > 259-277