The purpose of this study is to test how the skin of night shift workers responds to artificial sunlight (ultraviolet B radiation; UVB) at two different times of the day in comparison to normal day shift workers. After the skin biopsies are obtained, they will be brought to the laboratory to be exposed to UVB radiation and to measure UVB responses.
Protocol Amendment History
12 amendments
This ClinicalTrials.gov record has been amended 12 times since 2019-10-08; most recent amendment 2026-07-15.
Status change: Not Yet Recruiting → Recruiting2023-01-09