(A retrospective case control study to validate the association between Interleukin-1 gene variations and adult chronic periodontal disease in Chinese (Shanghai))
Inclusion Criteria:
- To be included in this study, an individual needs to be Han Chinese of 35 years of age or older at time of enrollment.
Exclusion Criteria:
- 1) Age younger than 35 years old. 2) Patients with diagnosis of rheumatoid arthritis, psoriasis, inflammatory bowel disease, glomerulonephritis/kidney disease, cancer, or Sjogren's syndrome.
3) Organ transplant recipients.