Is the antidepressive effect of sleep deprivation stabilized by a three day phase advance of the sleep period?: A pilot study. - Voderholzer, U.; Valerius, G.; Schaerer, L.; Riemann, D.; Giedke, H.; Schwärzler, F.; Berger, M.; Wiegand, M. (European Archives of Psychiatry & Clinical Neuroscience, 2003)