1. Division of Cancer Epidemiology McGill University Montreal Quebec Canada
2. Division of Oral Health and Society, Faculty of Dentistry McGill University Montreal Quebec Canada
3. Division of Cancer Epidemiology and GeneticsNational Cancer Institute Rockville MD USA
4. Department of EpidemiologyUniversity of Iowa College of Public Health Iowa City IA USA
5. New York State Cancer Registry, New York State Department of Health Albany NY USA
6. Michigan Department of Health and Human Services Lansing MI USA
7. Connecticut Tumor Registry, Connecticut Department of Public Health Hartford CT USA
8. Public Health Sciences, Fred Hutchinson Cancer Research Center Seattle WA USA