1. Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, 141 04 Huddinge, Sweden
2. Division of Endodontics, Department of Restorative Dental Science, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
3. Private Practice, Folktandvården Björkhagen, 120 08 Stockholm, Sweden
4. Academic Center for Geriatric Dentistry, 112 19 Stockholm, Sweden