Shahbazian P, Izad M, Daneshpazhooh M, et al. Decreased Serum Levels of Interleukin-4 and Interleukin-21 in New Pemphigus Vulgaris Patients, but Not Chronic Patients With Inactive Disease Compared to Healthy Controls. Dermatol Pract Concept. 2021;11(2):e2021035. doi:10.5826/dpc.1102a35