TY  - RPRT
TI  - Health problems after travel to developing countries.
AU  - R Steffen
AU  - M Rickenbach
AU  - U Wilhelm
AU  - A Helminger
AU  - M Schär
PY  - 1987
DO  - 10.1093/infdis/156.1.84
UR  - https://pubmed.ncbi.nlm.nih.gov/3598228/
ID  - 3598228
ER  -