1 Department of Dentistry and Oral & Maxillofacial Surgery, Thunder Bay Regional Health Sciences Center, 980 Oliver Road, Thunder Bay, Ontario P7B 6V4, Canada. Electronic address: b.pynn@shaw.ca.
2 Department of Dentistry and Oral & Maxillofacial Surgery, Thunder Bay Regional Health Sciences Center, 980 Oliver Road, Thunder Bay, Ontario P7B 6V4, Canada.