{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T15:33:10Z","timestamp":1791991990137,"version":"4.4.0"},"reference-count":22,"publisher":"Informa UK Limited","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["COPD: Journal of Chronic Obstructive Pulmonary Disease"],"published-print":{"date-parts":[[2012,5,23]]},"DOI":"10.3109\/15412555.2011.651180","type":"journal-article","created":{"date-parts":[[2012,2,23]],"date-time":"2012-02-23T14:21:30Z","timestamp":1330006890000},"page":"268-275","source":"Crossref","is-referenced-by-count":89,"title":["Sildenafil for Chronic Obstructive Pulmonary Disease: A Randomized Crossover Trial"],"prefix":"10.1080","volume":"9","author":[{"given":"David J.","family":"Lederer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew N.","family":"Bartels","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Neil W.","family":"Schluger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frances","family":"Brogan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricia","family":"Jellen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Byron M.","family":"Thomashow","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven M.","family":"Kawut","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"301","published-online":{"date-parts":[[2012,2,23]]},"reference":[{"key":"CIT0001","doi-asserted-by":"publisher","DOI":"10.1513\/pats.200611-159CC"},{"key":"CIT0002","doi-asserted-by":"publisher","DOI":"10.1378\/chest.127.6.1898"},{"key":"CIT0003","doi-asserted-by":"publisher","DOI":"10.1164\/ajrccm.164.2.2006129"},{"key":"CIT0004","doi-asserted-by":"publisher","DOI":"10.1136\/hrt.2007.138172"},{"key":"CIT0005","doi-asserted-by":"publisher","DOI":"10.7326\/0003-4819-93-3-391"},{"issue":"8222","key":"CIT0006","first-page":"681","volume":"1","author":"Report of the Medical Research Council Working Party","year":"1981","journal-title":"Lancet"},{"key":"CIT0007","doi-asserted-by":"publisher","DOI":"10.1159\/000195514"},{"key":"CIT0008","doi-asserted-by":"publisher","DOI":"10.1183\/09031936.00011308"},{"key":"CIT0009","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9343(93)90154-H"},{"key":"CIT0010","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(02)11024-5"},{"key":"CIT0011","doi-asserted-by":"publisher","DOI":"10.1161\/CIRCULATIONAHA.106.655266"},{"key":"CIT0012","doi-asserted-by":"publisher","DOI":"10.1016\/j.pupt.2008.01.012"},{"key":"CIT0013","doi-asserted-by":"publisher","DOI":"10.1164\/rccm.200907-0988OC"},{"key":"CIT0014","doi-asserted-by":"publisher","DOI":"10.1136\/thorax.58.4.289"},{"key":"CIT0015","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa050010"},{"key":"CIT0016","doi-asserted-by":"publisher","DOI":"10.7326\/0003-4819-149-8-200810210-00004"},{"key":"CIT0017","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa1002110"},{"key":"CIT0018","doi-asserted-by":"publisher","DOI":"10.1016\/j.pupt.2005.09.006"},{"key":"CIT0019","doi-asserted-by":"publisher","DOI":"10.1183\/09031936.00114207"},{"key":"CIT0020","doi-asserted-by":"publisher","DOI":"10.1111\/j.1475-6773.2005.0l374.x"},{"key":"CIT0021","doi-asserted-by":"publisher","DOI":"10.1016\/S0895-4356(96)00206-5"},{"key":"CIT0022","doi-asserted-by":"publisher","DOI":"10.1183\/09031936.94.07010055"}],"container-title":["COPD: Journal of Chronic Obstructive Pulmonary Disease"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/www.tandfonline.com\/doi\/pdf\/10.3109\/15412555.2011.651180","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2016,12,12]],"date-time":"2016-12-12T20:34:47Z","timestamp":1481574887000},"score":1,"resource":{"primary":{"URL":"http:\/\/www.tandfonline.com\/doi\/full\/10.3109\/15412555.2011.651180"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,2,23]]},"references-count":22,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2012,4,23]]},"published-print":{"date-parts":[[2012,5,23]]}},"alternative-id":["10.3109\/15412555.2011.651180"],"URL":"https:\/\/doi.org\/10.3109\/15412555.2011.651180","relation":{},"ISSN":["1541-2555","1541-2563"],"issn-type":[{"value":"1541-2555","type":"print"},{"value":"1541-2563","type":"electronic"}],"subject":[],"published":{"date-parts":[[2012,2,23]]}}}