ชื่อเรื่อง | Annals of periodontology : proceedings of the 1996 Joint Symposium on Clinical Trial Design and Analysis in Periodontics / The American Academy of Periodontology in co-operation with the National Institute of Dental Research, The American Association for Dental Research/International Association for Dental Research, and The American Dental Association and held January 30-February 2, 1996 at the Netcher Conference Center, National Institute of Health, Bethesda, Maryland |