['Supplementary', 'material', 'to', 'this', 'paper', 'includes', 'a', 'document', 'with', 'a', 'description', 'of', 'the', 'dataset', 'as', 'a', 'whole', ',', 'a', 'document', 'containing', 'the', 'complete', 'survey', 'instrument', ',', 'and', 'two', 'data', 'files', 'containing', 'the', 'results', 'and', 'an', 'associated', 'codebook', '(', 'see', 'Section', '4.3', ')', '.']