TY  - RPRT
TI  - WHO collaborative study on breast feeding.
AU  - Y Hofvander
AU  - A Petros-Barvazian
PY  - 1978
DO  - 10.1111/j.1651-2227.1978.tb17801.x
UR  - https://pubmed.ncbi.nlm.nih.gov/696302/
ID  - 696302
ER  -