Department of Pediatric-Adolescent Endocrinology and Diabetes;
Athens Medical Center;
Athens 15125;
Greece;
Endocrine Unit;
Aretaieion University Hospital;
Athens 11528;
Greece;
Department of Endocrinology;
Diabetology and Clinical Nutrition;
University Hospital Zurich(USZ);
University of Zurich(UZH);
CH-8091 Zurich;
Switzerland;
Special Unit of Dermatology;
First Department of Pediatrics;
National and Kapodistrian University of Athens Medical School;
Agia Sofia Children's Hospital;
Athens 11527;
Greece;
Alopecia totalis; Alopecia universalis; Alopecia focalis; Calcitriol; Paricalcitol; Vitamin D; Case report;