共 11 条
[1]
BACKERDIRKS O, 1967, INT DENT J, V17, P582
[2]
VALIDITY OF NONEXPERIMENTAL DESIGNS FOR EVALUATING HEALTH-SERVICES
[J].
HEALTH SERVICES REPORT,
1973, 88 (02)
:153-164
[4]
Helm S, 1973, Community Dent Oral Epidemiol, V1, P3, DOI 10.1111/j.1600-0528.1973.tb01055.x
[5]
HELM S, 1971, TANDLAEGEBLADET, V76, P331
[6]
HOROWITZ HS, 1973, INT DENT J, V23, P346
[7]
MOLLER IJ, 1973, SCAND J DENT RES, V81, P1
[8]
Poulsen S, 1973, Tandlaegebladet, V77, P398
[9]
RISAGER J, 1974, SCAND J DENT RES, V82, P570