Sample size. Preconditions: significance level (α) 5 % and power (β) 80 %. Test: unpaired T-test. Mean treatment time 11 days (SD 5) in this population. Relevant detection limit defined at 2 days. The bonferroni correction has been used to correct for the fact that 2 primary analysis will be performed, why α = 0.005/2 = 0.025. Estimated 100 patient in each arm, thus n = 300.