1. Department of Otorhinolaryngology–Head and Neck SurgeryUniversity of Pennsylvania Philadelphia PA
2. Department of Otolaryngology–Head and Neck Surgery, School of MedicineUniversity of California, Irvine (UCI) Irvine CA
3. Smell and Taste ClinicCentro Neurológico ABC, Centro Médico ABC Ciudad de México Mexico City Mexico
4. Corporal Michael J. Crescenz Veterans Administration Medical Center Philadelphia PA
5. Monell Chemical Senses Center Philadelphia PA