1. Division of Oral Medicine; College of Dentistry; Al-Mustansiriya University; Baghdad Iraq
2. Division of Pharmacoepidemiology; Division of Rheumatology; Brigham and Women's Hospital; Boston MA USA
3. Division of Oral Medicine and Dentistry; Brigham and Women's Hospital; Boston MA USA
4. Department of Oral Medicine; Infection and Immunity; Harvard School of Dental Medicine; Boston MA USA