Lee, I., Hong, S., Jang, E., Lee, J., Lee, J. (2026). Development of a Confined-Space Suitability Index (CSSI) using Least Absolute Shrinkage and Selection Operator (LASSO) regression: a pilot study for structured fitness-for-duty screening. PLoS ONE. https://doi.org/10.1371/journal.pone.0350740