In 2007 Belgium data is based on Flanders only. German data for 2003 is based on six regions only and seven regions in 2007 (Bavaria, Brandenburg, Berlin, Hesse, Mecklenburg-Western Pomerania, Saarland and Thuringia).
None
Hibell, et al, ESPAD surveys 1995, 1999, 2003, 2007
(see the help page for information about formats etc.)