Koundouros E, Odell E, Coward P, Wilson R, Palmer R M
Department of Periodontology and Preventive Dentistry, United Medical School, Guy's Thomas's Hospital, London, UK.
J Periodontal Res. 1996 Nov;31(8):596-9. doi: 10.1111/j.1600-0765.1996.tb00525.x.