Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: author="Schmidt, Ralph E." or (type any "bookEditor issueEditor" and editor="Schmidt, Ralph E.") Add to list Journal Article A1 Early predictors of impaired sleep : a study on life course socioeconomic conditions and sleeping problems in older adults Vera van de Straat (UGent) , Boris Cheval, Ralph E. Schmidt, Stefan Sieber, Delphine Courvoisier, Matthias Kliegel, Claudine Burton-Jeangros, Stéphane Cullati and Piet Bracke (UGent) (2020) AGING & MENTAL HEALTH. 24(2). p.322-332