Randomization and blinding
The cluster-level randomization was performed using a computer-generated list of random numbers. The eight clusters were given a number between 1 and 8 before they were randomly allocated to one of eight sequences (For patients, group allocation was determined by their admission dates, and whether the pertaining clusters were in the control- or intervention phase on that date. All patients were given identical study information on admission before consenting to participate, but to avoid unblinding