Medical Comorbidities and Gender Distribution Among Patients with Lichen Planopilaris and Frontal Fibrosing Alopecia: A Retrospective Cohort Study- Supplementary Methods

We performed a retrospective cohort study at Columbia University Irving Medical Center (CUIMC) to investigate the gender distribution and comorbidities associated with lichen planopilaris (LPP) and frontal fibrosis alopecia (FFA). we have included the supplemental methods for this analysis here. The full paper is available through the Journal of the American Academy of Dermatology.