1. Katowice Oncology Center , 26 Raciborska St., 41-074 Katowice , Poland ; and Institute of Physics , University of Silesia , 75, Pulku Piechoty 1A St., 41-500 Chorzow , Poland
2. Institute of Physics , University of Silesia , 75 Pulku Piechoty 1A St., 41-500 Chorzow , Poland
3. Katowice Oncology Center 26 Raciborska St., 41-074 Katowice , Poland