[1] Wroclaw Med Univ, Dept Genet, PL-50367 Wroclaw, Poland
[2] Wroclaw Med Univ, Dept Biol & Med Parasitol, PL-50367 Wroclaw, Poland
[3] Univ Limerick, Dept Math & Stat, Limerick, Ireland
[4] 4th Mil Hosp, Dept Clin Otolaryngol, Wroclaw, Poland
[5] Lower Silesian Oncol Ctr, Wroclaw, Poland
[6] Wroclaw Med Univ, Dept Otolaryngol, PL-50367 Wroclaw, Poland