Table 1 Participating centres

Academic Medical Centre^a

Amsterdam, the Netherlands

Bovenij Hospital

Amsterdam, the Netherlands

Catharina Hospital

Eindhoven, the Netherlands

Deventer Hospital

Deventer, the Netherlands

Flevo Hospital

Almere, the Netherlands

Haaglanden MC

The Hague, the Netherlands

Helsinki University Hospital^a

Helsinki, Finland

Jeroen Bosch Hospital

‘s-Hertogenbosch, the Netherlands

Maasstad Hospital

Rotterdam, the Netherlands

Noordwest Hospital Group

Alkmaar, the Netherlands

OLVG

Amsterdam, the Netherlands

Slotervaart Hospital

Amsterdam, the Netherlands

Spaarne Hospital

Amsterdam, the Netherlands

VU University Medical Centre^a

Amsterdam, the Netherlands

Westfries Hospital

Hoorn, the Netherlands