claim
A longitudinal study by Chang et al. (1997) tracked more than 1,000 male physicians over a 40-year period.
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- Extent and Health Consequences of Chronic Sleep Loss and ... - NCBI www.ncbi.nlm.nih.gov via serper
A longitudinal study by Chang et al. (1997) tracked more than 1,000 male physicians over a 40-year period.