Table 1.

Cohort size and participation in the seven countries considering two different enrollment definitions.

Country	Enrolled participants	Respondent participants, n (%)	Participants not involved in follow-up, n (%)
Sweden	2097	904 (43.11)	1193 (56.89)
United Kingdom	2171	1180 (54.35)	991 (45.65)
Netherlands	12,524	9679 (77.28)	2835 (22.64)
Belgium	3834	3042 (79.34)	792 (20.66)
France	3540	2227 (62.91)	1313 (37.09)
Italy	1354	657 (48.52)	697 (51.48)
Portugal	1152	788 (68.40)	364 (31.60)
Total	26,662	18,477 (69.30)	8185 (30.70)