Implementation {16c}
The randomization list will be generated using well-established software (randomization.org) for the two groups (intervention group, placebo group). Upon the arrival of the patient in the operating theatre, a study nurse will open an opaque envelope which is labeled with the patient’s identification code and prepare the study medication (30 ml ropivacaine 0.5% for the intervention group and 30 ml sodium chloride 0.9% for the placebo group) according to the study randomization and hand it to the blinded anesthetist.