?:authorAffiliation
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[\'Department of Clinical Immunology, University Hospital Lozenetz, Medical Faculty, Sofia University, St. Kliment Ohridski, Sofia 1407, Bulgaria. tsvelikova@medfac.mu-sofia.bg.\', \'Clinic of Internal Diseases, Naval Hospital - Varna, Military Medical Academy, Medical Faculty, Medical University, Varna 9000, Bulgaria.\', \'Department of Clinical Immunology, University Hospital Lozenetz, Medical Faculty, Sofia University, St. Kliment Ohridski, Sofia 1407, Bulgaria.\', \'Department of Epidemiology and Disaster Medicine, Medical University, Plovdiv, University Hospital \'St George\', Plovdiv 6000, Bulgaria.\', \'Clinic of Gastroenterology, Tsaritsa Joanna University Hospital, Medical University of Sofia, Sofia 1527, Bulgaria.\']
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