Patients who are severely cognitive impaired will not be able to participate in the study. The doctor in charge will judge whether a patient is capable of participating or not. As help, the doctor can use a Pfeiffer test, where the patient should score >3 to be eligible to participate. However, it should be noted that right after surgery, patients might score less, even though they should not be considered cognitive impaired. Therefore it is important that the doctor makes a professional judgment of the patient’s capability.
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