1. Internal and Geriatric Medicine Department, Rheumatologic Outpatient Clinic, Azienda Sanitaria Locale Napoli 3 Sud, Health District No. 59, Sant’Agnello, 80065 Naples, Italy
2. Primary Care Department, Azienda Sanitaria Provinciale Catanzaro, 88068 Soverato, Italy
3. Library and Knowledge Services, Central and North West London NHS Foundation Trust, London NW1 3AX, UK