Poultry is commonly considered the principal source, and in some studies, was implicated in 50% to 70% of endemic cases (1, 2 ).
Most of the children with elevated blood lead levels (n = 46; 70.8%) lived in homes without lead drinking-water service lines, which is the principal source of lead in drinking water in older cities.
This may indicate that E2-stimulated uNK cells may be the principal source of CCL2 in the endometrial microenvironment in early pregnancy.
As can be seen from Table 4, BPA intakes from 19 of the 55 samples account for more than 95% of the total dietary intakes, and most of the 19 samples were either canned or in jars, thus the principal source of BPA in foods is most likely from the migration from can coating.
Fire is the principal source of disturbance in fynbos, and fire regimes vary greatly in their season of occurrence, frequency, extent and intensity [11].
In general, decomposition results indicate that changes in actual diarrhoea prevalence and/or health behaviour are the principal source of decline in diarrhoea prevalence between 2001 and 2007 regardless of the exposure variable (table 3, column B).
The NHIS is an in-person household survey conducted by the Census Bureau for the National Center for Health Statistics, and is the principal source of information in the U.S. on the health of the civilian, non-institutionalized household population.
Montreal is the network's principal source for programming in French, and Toronto is its main source for programming in English; Vancouver, B.C., and Winnipeg, Man., are other important sources of English-language programming.
And the drug companies, their discoveries safely protected by patents, are the principal source of innovation in modern medicine.Reforming these attitudes would not be easy in the best of circumstances, but the WHO's structure will make it harder.
To gain further definition of the Na,K-ATPase isoforms at these barriers, we localize the Na,K-ATPase alpha −1, -2, and −3 isoform expression at the principal source of CSF (in the CP), at the sites of intracranial trigeminal nociception (in the meninges), and at the sites of ocular sodium regulation (in the ciliary body and retina).
