TY - JOUR AU - Skarupke, C; Schlack, R; Lange, K TI - Insomnia complaints and substance use in German adolescents: did we underestimate the role of coffee consumption? Results of the KiGGS study JO - Journal of neural transmission PY - 2015 DO - 10.1007/s00702-015-1448-7 N1 - et al. ER -