1 Dermatology Department, Trichology Unit, Ramon y Cajal University Hospital, Madrid, Spain. Electronic address: belen.de.nicolas@gmail.com.
2 Dermatology Department, Trichology Unit, Ramon y Cajal University Hospital, Madrid, Spain; Trichology and Hair Transplantation Unit, Grupo Pedro Jaen Clinic, Madrid, Spain.
3 Trichology and Hair Transplantation Unit, Grupo Pedro Jaen Clinic, Madrid, Spain.
4 Dermatology Department, Trichology Unit, Ramon y Cajal University Hospital, Madrid, Spain.