1. University of Rochester Eastman Institute for Oral Health; Department of Prosthodontics; 601 Elmwood Ave, Box 683 Rochester NY Italy 14642
2. University of Rochester Eastman Institute for Oral Health; Department of Prosthodontics; 601 Elmwood Ave, Box 683 Rochester NY USA 14642
3. School of Dentistry, University of Milan, Maxillofacial Surgery and Dentistry UOC, Fondazione IRCCS Ca' Granda; Implant Centre for Edentulism and Jawbone Atrophies; Milan Italy
4. Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester; Cochrane Oral Health; Coupland Building 3, Oxford Road Manchester UK M13 9PL