{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T08:58:46Z","timestamp":1762505926277},"reference-count":5,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"6","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["Circulation"],"published-print":{"date-parts":[[2001,2,13]]},"DOI":"10.1161\/01.cir.103.6.e30","type":"journal-article","created":{"date-parts":[[2012,6,12]],"date-time":"2012-06-12T00:09:32Z","timestamp":1339459772000},"update-policy":"http:\/\/dx.doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["Ergonovine Maleate and \u03b2-Blockers for Prinzmetal\u2019s Angina"],"prefix":"10.1161","volume":"103","author":[{"given":"Tsung O.","family":"Cheng","sequence":"first","affiliation":[{"name":"Professor of Medicine, The George Washington University Medical Center, Washington, DC 20037"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"276","reference":[{"key":"e_1_3_1_1_2","doi-asserted-by":"publisher","DOI":"10.1161\/circ.101.11.e107"},{"key":"e_1_3_1_2_2","doi-asserted-by":"publisher","DOI":"10.1161\/circ.47.3.476"},{"key":"e_1_3_1_3_2","first-page":"585","volume":"53","year":"1976","unstructured":"Cheng TO. Ergotrate in coronary artery spasm. Circulation. 1976;53:585\u2013586.","journal-title":"Circulation"},{"key":"e_1_3_1_4_2","first-page":"1647","volume":"80","year":"1997","unstructured":"Cheng TO. Clinical implication of the hyperventilation test in the diagnosis of coronary artery spasm. Am J Cardiol. 1997;80:1647.","journal-title":"Am J Cardiol"},{"key":"e_1_3_1_5_2","unstructured":"Cheng TO Yasue H. Coronary artery spasm. In: Cheng TO ed. The International Textbook of Cardiology. New York: Pergamon; 1987:621\u2013637."}],"container-title":["Circulation"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ahajournals.org\/doi\/full\/10.1161\/01.CIR.103.6.e30","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,5,12]],"date-time":"2024-05-12T13:06:03Z","timestamp":1715519163000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ahajournals.org\/doi\/10.1161\/01.CIR.103.6.e30"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2001,2,13]]},"references-count":5,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2001,2,13]]}},"alternative-id":["10.1161\/01.CIR.103.6.e30"],"URL":"https:\/\/doi.org\/10.1161\/01.cir.103.6.e30","relation":{},"ISSN":["0009-7322","1524-4539"],"issn-type":[{"value":"0009-7322","type":"print"},{"value":"1524-4539","type":"electronic"}],"subject":[],"published":{"date-parts":[[2001,2,13]]},"assertion":[{"value":"2001-02-13","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}