Question: what is the meaning of rdw in medical terms
[{'answer': 'Red blood cell distribution width', 'provenance': [{'wikipedia_id': '593422', 'title': 'Red blood cell distribution width', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '593422', 'title': 'Red blood cell distribution width', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 720, 'bleu_score': 0.9845548242372031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12379298553122455496}, 'section': 'Section::::Abstract.'}]}]