RT Journal Article SR Electronic T1 Contemporary impact of tobacco use on periodontal disease in the USA JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 237 OP 238 DO 10.1136/tobaccocontrol-2015-052750 VO 26 IS 2 A1 Vogtmann, Emily A1 Graubard, Barry A1 Loftfield, Erikka A1 Chaturvedi, Anil A1 Dye, Bruce A A1 Abnet, Christian C A1 Freedman, Neal D YR 2017 UL http://tobaccocontrol.bmj.com/content/26/2/237.abstract AB