Quality of life in nonorganic and organic sleep disorders: II. Correlation with objective and subjective quality of sleep and awakening. - Prause W; Saletu B; Anderer P; Gruber G; Löffler-Stastka H; Klösch G; Mandl M; Grätzhofer E; Saletu-Zyhlarz G; Katschnig H (Wiener klinische Wochenschrift, 2003)