After six months, no difference will be expected between group 1a and 1b or 2a and 2b, respectively. In the investigator's experience there will be no confounders which may influence nerve regeneration. A similar patient satisfaction will be expected between the groups. The investigator expect a higher patient satisfaction in group 2b than in group 2a due to nerve tissue harvest. Between group 1a and 1b no difference is expected regarding MHQ.