Figure. Schematic Diagram Showing the Enrollment and Categorization of Patients With Vitiligo According to the Number of Narrowband UV-B (NBUVB) Sessions of Phototherapy.

^aThere were patients who had more than 1 case of precancerous skin lesions or skin cancer.

^bPatients who had not received phototherapy.

^cPatients who had received less than 50 sessions.

^dPatients who had received 50 or more sessions.

^ePatients who had received 50 to 99 sessions.

^fPatients who had received 100 to 199 sessions.

^gPatients who had received 200 or more sessions.