Altoona Arthritis & Osteoporosis Center. Altoonaarthritis.com DA: 24 PA: 24 MOZ Rank: 48. The Altoona Center for Clinical Research (ACCR) is a world class facility where research work focuses on the development of newer strategies for treating patients with arthritis and rheumatic disorders; The center was founded in 1992 and has conducted more than 1000 clinical trials for drug companies such ....