Second International Congress of Dermatology, Vienna. Photograph by Dr Székely, 1892. https://www.rawpixel.com/image/13959580/photo-image-people-music-public-domainFree Image from public domain licenseSecond International Congress of Dermatology, Vienna. Photograph by Dr Székely, 1892. https://www.rawpixel.com/image/14018748/photo-image-person-music-public-domainFree Image from public domain licenseSecond International Congress of Dermatology, Vienna. Photograph by Dr Székely, 1892. https://www.rawpixel.com/image/14000082/photo-image-face-person-clothingFree Image from public domain license