For Baseline Assessment visits (1A Visit 1 and 1A Visit 2) and 2nd Assessment visits (2A Visit 1 and 2A Visit 2), Lifelines participants could visit a location of their preference.

The following locations were used:

• Groningen city: n=23.209 [1A] and n=24.191 [2A]
• Bedum: n=10.310 [1A]
• Oude Pekela: n=17.899 [1A] and n=12.904 [2A]
• Oosterwolde: n=3.823 [1A]

• Leeuwarden: n=18.075 [1A] and n=13.239 [2A]
• Drachten: n=20.937 [1A] and n=17.316 [2A]
• Heerenveen: n=10.268 [1A] and n=7.527 [2A]
• Sneek: n=16.432 [1A] and n=11.967 [2A]
• Terschelling: n=1.295 [1A]

• Assen: n=16.571 [1A] and n=11.474 [2A]
• Hoogeveen: n=11.076 [1A] and n=7.829 [2A]
• Emmen: n=18.509 [1A] and n=13.465 [2A]