1. Oncological Package Unit, 4th Military Teaching Hospital, 50-981 Wroclaw, Poland
2. Department of Surgery, 4th Military Teaching Hospital, 50-981 Wroclaw, Poland
3. Department of Nursing and Obstetrics, Division of Anesthesiological and Surgical Nursing, Faculty of Health Science, Wroclaw Medical University, 50-367 Wroclaw, Poland
4. Department of Otolaryngology, Head and Neck Surgery, 4th Military Teaching Hospital, 50-981 Wroclaw, Poland