Question: where did the bristol stool chart come from
[{'answer': 'England', 'provenance': [{'wikipedia_id': '3407240', 'title': 'Bristol stool scale', 'start_paragraph_id': 16, 'start_character': 45, 'end_paragraph_id': 16, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Dr. Stephen Lewis', 'provenance': [{'wikipedia_id': '3407240', 'title': 'Bristol stool scale', 'start_paragraph_id': 16, 'start_character': 56, 'end_paragraph_id': 16, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Dr. Ken Heaton', 'provenance': [{'wikipedia_id': '3407240', 'title': 'Bristol stool scale', 'start_paragraph_id': 16, 'start_character': 78, 'end_paragraph_id': 16, 'end_character': 92, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Scandinavian Journal of Gastroenterology', 'provenance': [{'wikipedia_id': '3407240', 'title': 'Bristol stool scale', 'start_paragraph_id': 16, 'start_character': 238, 'end_paragraph_id': 16, 'end_character': 278, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '3407240', 'title': 'Bristol stool scale', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 864, 'bleu_score': 0.8927579572419101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15155288759156064624}, 'section': 'Section::::History.\n'}]}]