TY JOUR TI Impact of Chernobyl Accident Factors on Psychoneurological Status of Liquidators – Helicopter-pilots KW Chernobyl accident KW radiation KW liquidators KW helicopter-pilots KW morbidity KW psychoneurological status KW psychosocial status JO Medical Radiology and radiation safety AU Ushakov, I.B. AU Fedorov, V.P. PY 2018 IS 63 PB Federal Medical Biological Agency of Russia