Ozaslan E, Purnak T. Controversies about occult hepatitis B virus infection. World J Gastroenterol 2009; 15(39): 4986-4987 [PMID: 19842236 DOI: 10.3748/wjg.15.4986]
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Ersan Ozaslan, Associate Professor of Gastroenterology, Department of Gastroenterology, Ankara Numune Education and Research Hospital, Ankara 06100, Turkey. er72@hotmail.com
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