Question: who introduced the use of artificial heart for surgery
[{'answer': 'Paul Winchell', 'provenance': [{'wikipedia_id': '256461', 'title': 'Artificial heart', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::History.:Early designs of total artificial hearts.\n'}]}, {'provenance': [{'wikipedia_id': '256461', 'title': 'Artificial heart', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 446, 'bleu_score': 0.5183551948685571, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1222892884532315406}, 'section': 'Section::::History.:Early designs of total artificial hearts.\n'}]}]