PT Journal AU Valenta, M Michalik, J Raver-Lampman, S Michalek, A SO e-Pedagogium PY 2011 BP 102 EP 119 VL 11 IS 4 DI 10.5507/epd.2011.053 DE Caregivers' perceptions; caregivers of individuals with intellectual disabilities; comparison of caregivers' attitudes in United States and Czech Republic ER