24.Christen, AG, Swanson, BZ, Glover, Ed, et al. Smokeless tobacco: the folklore and social history of snuffing, sneezing, dipping and chewing. J Am Dent Assoc, 1982, 105: 821–829.
25.Christen, AG. The case against smokeless tobacco: five facts for the health professional to consider. J Am Dent Assoc, 1980, 101: 464–469.
26.Wahlberg, I, Ringberger, T. Smokeless tobacco. In: Davis, DL, Nielsen, MT, editors. Tobacco: Production, Chemistry and Technology. Oxford (United Kingdom): Blackwell Science, 1999, 452–460.
27.Rodu, B. Smokeless tobacco and oral cancer: a review of the risks and determinant. Crit Rev Oral Biol Med, 2004, 15: 252–263.
28.Christen, AG, Armstrong, WR, McDaniel, RK. Intraoral leukoplakia, abrasion, periodontal breakdown and tooth loss in a snuff dipper. J Am Dent Assoc, 1979, 98: 584–586.
29.Greer, RO, Poulson, TC, Boone, ME. Smokeless tobacco associated oral changes in juvenile, adult and geriatric patients: clinical and histomorphologic features. Gerodontics, 1986, 2: 87–98.
30.Squier, CA. Smokeless tobacco and oral cancer: a cause for concern? CA Cancer J Clin, 1984, 34: 242–247.
31.Grady, D, Greene, J, Daniels, TE, et al. Oral mucosal lesions found in smokeless tobacco users. J Am Dent Assoc, 1990, 121: 117–123.
32.Greer, RO, Poulson, TC. Oral tissue alterations associated with the use of smokeless tobacco by teenagers. Part I. Clinical findings. Oral Surg Oral Med Oral Pathol, 1983, 56: 275–284.
33.Pindborg, JJ, Renstrup, G. Studies in oral leukoplakia. I. The influence of snuff on the connective tissue of the oral mucosa. Preliminary report. Acta Pathol Micro-Biol Scand, 1962, 55: 412–414.
34.Hirsch, JM, Livian, G, Edwards, S, et al. Tobacco habits among teenagers in the city of Gõteborg, Sweden and possible association with dental caries. Swed Dent J, 1991, 15: 117–123.
35.Bill, TJ, Reddy, VR, Ries, KL, Gampper, TJ, Hoard, MA. Adolescent gingival squamous cell carcinoma: report of a case and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2001, 91: 682–685.
36.Thompson, L, Castle, J, Heffner, DK. Oral squamous cell carcinoma in pediatric patients: a clinicopathologic study of 20 cases (abstract), Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 1999, 88: 204.
37.Atula, S, Grenman, R, Laippala, P, Syrjänen, . Cancer of the tongue in patients younger than 40 years. Arch Laryngol Head Neck Surg, 1996, 122: 1313–1319.
38.Sarkaria, JN, Harari, PM. Oral tongue cancer in young adults less than 40 years of age: rationale for aggressive therapy. Head Neck, 1994, 16: 107–111.
39.Tsukuda, M, Ooishi, K, Mochimatsu, I, Sato, H. Head and neck carcinomas in patients under the age of forty years. Jpn J Cancer Res, 1993, 84: 748–752.
40.Lund, VJ, Howard, DJ. Head and neck cancer in the young: a prognostic conundrum? J Laryngol Otol, 1990, 104: 544–548.
41.Keukens, F, van Voorst Vader, PC, Panders, AK, et al. Xeroderma pigmentosum: squamous cell carcinoma of the tongue. Acta Derm Venereol, 1989, 69: 530–531.
42.Earle, AS, Park, CH, Viastou, . Oral squamous cell carcinoma in children. Ann Plast Surg, 1988, 20: 148–152.
43.Sacks, HG, Holly, R, Blum, B, Joy, ED. Case 58: maxillary alveolar mass in a 13-year old boy. J Oral Maxillofac Surg, 1985, 43: 958–963.
44.Son, YH, Kapp, DS. Oral cavity and oropharyngeal cancer in a younger population. Cancer, 55: 1985, 441–444.
45.Newman, AN, Rice, DH, Ossoff, RH, Sisson, GA. Carcinoma of the tongue in persons younger than 30 years of age. Arch Otolaryngol, 1983, 109: 302–304.
46.McGregor, GI, David, N, Robins, RE. Squamous cell carcinoma of the tongue and lower oral cavity in patients under 40 years of age. Am J Surg, 1983, 146: 88–92.
47.Yagi, K, Ali, AEL G, Abbas, KEL D, Prabhu, SR. Carcinoma of the tongue in a patient with xeroderma pigmentosum, Int J Oral Surg, 1981, 10: 73–76.
48.Harper, JI, Copeman, PW. Carcinoma of the tongue in a boy with xeroderma pigmentosum. Clin Exp Dermatol, 1981, 6: 601–604.
49.Krolls, SO, Hoffman, S. Squamous cell carcinoma of the oral soft tissues: a statistical analysis of 14,253 cases by age, sex, and race of patients. J Am Dent Assoc, 1976, 92: 571–574.
50.Byers, RM. Squamous cell carcinoma of the oral tongue in patients less than thirty years of age. Am J Surg, 1975, 130: 475–478.
51.Weitkunat, R, Sanders, E, Lee, PN, et al. Meta-analysis of the relation between European and American smokeless tobacco and oral cancer. BMC Public Health, 2007, 15: 334–354.
52.Greer, RO, Hoernig, G, Shroyer, KR. Telomerase expression in precancerous oral verrucous leukoplakia. Int J Oral Biol, 1999, 24: 1–5.
53.Palefsky, JM, Greenspan, JS, Daniels, TE. Interaction between smokeless tobacco-related carcinogens and human papillomaviruses in the pathogenesis of oral cancer and dysplasia. In: National Institutes of Health Monograph 2, Smokeless Tobacco or Health: An International Perspective. Bethesda (MD): NIH Publication, No. 93-3461; 1993, 175–182, Chapter 3.
54.Greer, RO. Oral manifestations of smokeless tobacco use. Eusterman, VD Meyers, A, eds Otolaryngologic Clinics of North America. Philadelphia: W. B. Saunders Company, 2011, 44: 31–56.
55.Hashibe, M, Brenan, P, Shu-chun, C, et al. Interaction between tobacco and alcohol use and the risk of head and neck cancer: pooled analysis in the intermitronal head and neck epidemiology consortium. Cancer Epidemiol Biomarkers Prev, 2009, 18: 541–550.