Significance levels All tests will be two-tailed. For the primary outcome the risk of type I error is set to 5% (i.e., a significance level of P<0.05). As we have 8 secondary outcomes, we adjust the significance levels to P<0.01 to control the familywise (or cumulative) type I error due to multiplicity. The P-values of the exploratory outcomes will be provided, but it will be made clear that the analyses are exploratory.