Serum Th1, Th2, Th17, and innate immune system biomarkers are elevated in pediatric alopecia areata with and without concurrent atopic dermatitis: A cross-sectional study - Ryan S.Q. Geng, MSc; Katherine A. Buhler, BHSc; May Y. Choi, MD, MPH; David Croitoru, MD, MSc; Elena Pope, MD, MSc; Marvin J. Fritzler, MD, PhD; Cathryn Sibbald, MD (JAAD International)