Carswell, C. ., Lio, C. ., Grant, R. ., Klein, M. ., Clarke, D. ., Seales, W. ., & Strup, S. . (2010). Hands-free administration of subjective workload scales: acceptability in a surgical training environment. Applied Ergonomics, 42(1), 138-45. https://doi.org/10.1016/j.apergo.2010.06.003