1. Department of Pharmacy, Laiko General Hospital, Athens, Greece
2. Department of Microbiology, Medical School, University of Athens, Greece
3. First Department of Propaedeutic Medicine, Medical School, University of Athens, Greece
4. Department of Microbiology, Medical School, University of Thessaly, Larissa, Greece
5. First Department of Propaedeutic Medicine, Medical School, University of Athens, Greece.