EXTRA Cohort 16 (2020)
EXTRA Cohort 15 (2019)
EXTRA Cohort 14 (2018)
EXTRA Cohort 13 (2017)
EXTRA Cohort 12 (2016)
EXTRA Cohort 11 (2014)
EXTRA Cohort 10 (2013)
EXTRA Cohort 9 (2012)
EXTRA Cohort 8 (2011)
EXTRA Cohort 7 (2010)
EXTRA Cohort 6 (2009)
EXTRA Cohort 5 (2008)
EXTRA Cohort 4 (2007)
EXTRA Cohort 3 (2006)
EXTRA Cohort 2 (2005)
EXTRA Cohort 1 (2004)