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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1662754 | PMC |
| http://dx.doi.org/10.1136/bmj.300.6731.1079 | DOI Listing |
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Department of Agricultural Microbiology, Agriculture and Biology Research Institute, National Research Centre, 33 EI Buhouth St., Dokki, Cairo 12622, Egypt.
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