1. Department of Ophthalmology; Centro Veterinario Specialistico (CVS); Via Sandro Giovannini 53 Rome 00137 Italy
2. Department of Veterinary Sciences and Public Health (DiVet); University of Milan; via Celoria 10 Milan 20133 Italy
3. Department of Veterinary Sciences; University of Teramo; Strada Provinciale 18 snc, Piano d'Accio Teramo 64100 Italy
4. Long Island Veterinary Specialists; 63 South Service Road Plainview 11803 NY USA