| Literature DB >> 4349693 |
S Punyagupta, L C Olson, U Harinasuta, K Akarawong, W Varawidhya.
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Year: 1973 PMID: 4349693 DOI: 10.1093/oxfordjournals.aje.a121515
Source DB: PubMed Journal: Am J Epidemiol ISSN: 0002-9262 Impact factor: 4.897