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Journal of Occupational Medicine. : Official Publication of the Industrial Medical Association|June 1, 1992
Preemployment drug screening. The epidemiologic issuesC Zwerling, J RyanJournal of Occupational Medicine. : Official Publication of the Industrial Medical Association|May 1, 1990
Severity of disability due to occupational low back injury after lumbar laminectomy for degenerative disc diseaseJ Ryan, C ZwerlingAmerican Journal of Industrial Medicine|January 1, 1991
Risk and severity of non-back occupational injuries after lumbar laminectomy for degenerative disc diseaseC Zwerling, J RyanSpine|June 1, 1990
Risk for occupational low-back injury after lumbar laminectomy for degenerative disc diseaseJ Ryan, C ZwerlingSpine|July 1, 1993
A case-control study of risk factors for industrial low back injury. The utility of preplacement screening in defining high-risk groupsC Zwerling, J Ryan, M SchootmanJournal of Occupational Medicine. : Official Publication of the Industrial Medical Association|November 1, 1992
The effectiveness of preemployment drug screening in the prediction of employment outcomeJ Ryan, C Zwerling, M JonesJournal of Occupational and Environmental Medicine|September 1, 1996
Cigarette smoking at hire as a predictor of employment outcomeJ Ryan, C Zwerling, M JonesJAMA|November 28, 1990
The efficacy of preemployment drug screening for marijuana and cocaine in predicting employment outcomeC Zwerling, J Ryan, E J OravAmerican Journal of Public Health|January 1, 1992
Occupational risks associated with cigarette smoking: a prospective studyJ Ryan, C Zwerling, E J OravPageof 467