1. Doctoral School of Medical and Health Sciences, Jagiellonian University Medical College, 31-121 Cracow, Poland
2. Statistical Laboratory, Institute of Nursing and Midwifery, Faculty of Health Sciences, Jagiellonian University Medical College, 31-126 Cracow, Poland
3. Faculty of Health Sciences, Jagiellonian University Medical College, 31-501 Cracow, Poland
4. Department of Microbiology, Jagiellonian University Medical College, 31-121 Cracow, Poland