TY  - RPRT
TI  - [Methodological problems of longitudinal studies on schizophrenia].
AU  - H Häfner
AU  - W an der Heiden
PY  - 2000
DO  - 10.1055/s-2000-12144
UR  - https://pubmed.ncbi.nlm.nih.gov/10858944/
ID  - 10858944
ER  -