class_docstr: ``DenoiseAndSegment`` is the name of our combined workflow. Note that
  it needs to extend CombinedWorkflow for everything to work properly.
code: def _get_sub_flows(self):
      return [NLMeansFlow, MedianOtsuFlow]
  
      """
          It is mandatory to implement this method if you want to make all the
          sub workflows parameters available in commandline.
          """
  
imports: from dipy.workflows.combined_workflow import CombinedWorkflow
  from dipy.workflows.denoise import NLMeansFlow
  from dipy.workflows.segment import MedianOtsuFlow
label_desc: Use image node_id 1 for calling the DenoiseAndSegment obj's underlying member method code with example usage: obj._get_sub_flows() and returns: list