Usefulness of high-frequency ultrasonography in the assessment of alopecia areata – comparison of ultrasound images with trichoscopic images - Mikiel, Dominik; Polańska, Adriana; Żaba, Ryszard; Adamski, Zygmunt; Dańczak-Pazdrowska, Aleksandra (Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii, 2022)