code: def extractAllReviewers(self):
      for imageData in self.nameToImageData.values():
          if imageData.isSegemented():
              reviewer = imageData.getApprovedBy()
              if reviewer not in self.reviewers and reviewer != "":
                  self.reviewers.append(reviewer)
  
imports: import datetime
  import logging
  from typing import Dict, List
  from MONAILabelReviewerLib.ImageData import ImageData
  from MONAILabelReviewerLib.MONAILabelReviewerEnum import Level
label_desc: Use image node_id 5 for calling the ImageDataExtractor obj's underlying member method code with example usage: obj.extractAllReviewers() without return types