1 Vilnius Implantology Center, Vilnius, LT-01205, Lithuania. Electronic address: simonas.grybauskas@gmail.com.
2 Department of Medical Sciences, Uppsala University, SE-751 85 Uppsala, Sweden. Electronic address: par.hallberg@medsci.uu.se.
3 Kaunas implantology center, Kalnieciu 247, Kaunas, Lithuania. Electronic address: dairazuk@yahoo.com.
4 Department of Oral and Maxillofacial Surgery, Central Hospital, Västerås, SE-721 89 Västerås, Sweden; Section of Orthopaedics, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden. Electronic address: kharazmi.mohammad@gmail.com.