1. Allergy and Clinical Immunology Department; Centro Médico Docente La Trinidad; Caracas Venezuela
2. Allergy Service; Clínica El Avila; Caracas Venezuela
3. Allergy Service; Centro Médico de Caracas; Caracas Venezuela
4. Dermatology Service; Centro Médico de Caracas; Caracas Venezuela
5. Department of Dermatology and Allergy; Allergie-Centrum Charité/ECARF; Charité - Universitätsmedizin Berlin; Berlin Germany