1. VOIVODSHIP AMBULANCE SERVICE IN KATOWICE, KATOWICE, POLAND; DEPARTMENT OF EMERGENCY MEDICAL SERVICE, FACULTY OF MEDICINE, SILESIAN ACADEMY IN KATOWICE, KATOWICE, POLAND
2. VOIVODSHIP AMBULANCE SERVICE IN KATOWICE, KATOWICE, POLAND; CENTRAL SCHOOL OF THE STATE FIRE DEPARTMENT IN CZESTOCHOWA, CZESTOCHOWA, POLAND
3. DEPARTMENT OF EMERGENCY MEDICAL SERVICE, FACULTY OF MEDICINE, SILESIAN ACADEMY IN KATOWICE, KATOWICE, POLAND; REGIONAL AMBULANCE SERVICE IN SOSNOWIEC, SOSNOWIEC, POLAND
4. DEPARTMENT OF EMERGENCY MEDICINE, MEDICAL UNIVERSITY OF BIALYSTOK, BIALYSTOK, POLAND
5. DEPARTMENT OF EMERGENCY MEDICAL SERVICE, MEDICAL UNIVERSITY OF WARSAW, WARSAW, POLAND