1 Institute of Psychiatry and Neurology, Ist Neurological Department, Sobieskiego 9 St., 02-957 Warsaw, Poland. Electronic address: mgugala@ipin.edu.pl.
2 Institute of Psychiatry and Neurology, Ist Neurological Department, Sobieskiego 9 St., 02-957 Warsaw, Poland.
3 Military Institute of Aviation Medicine, Zygmunta Krasińskiego 54/56 St., 01-755 Warsaw, Poland.