TY  - RPRT
TI  - [The National Research Program 1A: a community-oriented intervention study. Methodological considerations on various types of studies].
AU  - F Gutzwiller
PY  - 1980
DO  - 10.1007/bf02078489
UR  - https://pubmed.ncbi.nlm.nih.gov/7006252/
ID  - 7006252
ER  -