Dr Stoyan Borisov may be contacted via University Hospital of Obstetrics and Gynaecology “Maichin dom” Sofia , 2, Zdrave Street, Sofia, Bulgaria; sborissov@mail.bg
PSK (Krestin) is a extract of Coriolus versicolor developed by Kureha Chemical Industry Company and licensed to Sankyo Pharmaceuticals Ltd in the 1980s for use as adjunct immunoth...
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