['For', 'readers', 'who', 'are', 'unfamiliar', 'with', 'the', 'physiological', 'aspects', 'of', 'the', 'research', ',', 'we', 'provide', 'Appendices', '\xa0', 'A', 'on', 'the', 'cardiovascular', 'system', 'and', 'B', 'on', 'how', 'measurements', 'of', 'cardiovascular', 'signals', 'are', 'conducted', '.']