string: However, the results of studies by Sajedi and Alizad,[20] Ghahramani
   and Tavakolizade,[21] Amir Ali Akbari et al.,[15] Nouhjah et al.,[30] Ozbek et al.,[39] Hediger et al.,[18] Potijk et al.[25] and Richter and Janson[24] are in contradiction with the above results.