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[2]
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[4]
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[5]
HOFFMANN C, 1933, 3 C AS MED PAN MEX, P777
[6]
NAPIER E, 1944, MEDICINE, V23, P149
[7]
ROSALES AG, 1938, B SAN GUATEMALA, V5, P1
[8]
STRONG RP, 1934, CONTRIBUTION HARVARD, V6