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Sueda S, Izoe Y, Kohno H, Fukuda H, Uraoka T. Need for documentation of guidelines for coronary artery spasm: An investigation by questionnaire in Japan. <i>Circ J<\/i> 2005; 69: 1333\u20131337.","DOI":"10.1253\/circj.69.1333"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Ong P, Athanasiadis A, Borgulya G, Mahrholdt H, Kaski JC, Sechtem U. High prevalence of a pathological response to acetylcholine testing in patients with stable angina pectoris and unobstructed coronary arteries: The ACOVA Study (Abnormal COronary VAsomotion in patients with stable angina and unobstructed coronary arteries). <i>J Am Coll Cardiol<\/i> 2012; 59: 655\u2013662.","DOI":"10.1016\/j.jacc.2011.11.015"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. JCS Joint Working Group. Guidelines for diagnosis and treatment of patients with vasospastic angina (coronary spastic angina) (JCS 2013): Digest version. <i>Circ J<\/i> 2014; 78: 2779\u20132801.","DOI":"10.1253\/circj.CJ-66-0098"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Okumura K, Yasue H, Matsuyama K, Goto K, Miyagi H, Ogawa H, et al. Sensitivity and specificity of intracoronary injection of acetylcholine for the induction of coronary artery spasm. <i>J Am Coll Cardiol<\/i> 1988; 12: 883\u2013888.","DOI":"10.1016\/0735-1097(88)90449-4"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Ong P, Athanasiadis A, Borgulya G, Vokshi I, Bastiaenen R, Kubik S, et al. Clinical usefulness, angiographic characteristics, and safety evaluation of intracoronary acetylcholine provocation testing among 921 consecutive white patients with unobstructed coronary arteries. <i>Circulation<\/i> 2014; 129: 1723\u20131730.","DOI":"10.1161\/CIRCULATIONAHA.113.004096"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Sueda S, Kohno H, Ochi T, Uraoka T. Overview of the acetylcholine spasm provocation test. <i>Clin Cardiol<\/i> 2015; 38: 430\u2013438.","DOI":"10.1002\/clc.22403"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Sueda S, Kohno H, Miyoshi T, Sakaue T, Sasaki Y, Habara H. Maximal acetylcholine dose of 200 \u03bcg into the left coronary artery as a spasm provocation test: Comparison with 100 \u03bcg of acetylcholine. <i>Heart Vessels<\/i> 2015; 30: 771\u2013778.","DOI":"10.1007\/s00380-014-0563-y"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Takagi Y, Yasuda S, Takahashi J, Tsunoda R, Ogata Y, Seki A, et al. Clinical implications of provocation tests for coronary artery spasm: Safety, arrhythmic complications, and prognostic impact: Multicentre registry study of the Japanese Coronary Spasm Association. <i>Eur Heart J<\/i> 2013; 34: 258\u2013267.","DOI":"10.1093\/eurheartj\/ehs199"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Takagi Y, Takahashi J, Yasuda S, Miyata S, Tsunoda R, Ogata Y, et al. Prognostic stratification of patients with vasospastic angina: A comprehensive clinical risk score developed by the Japanese Coronary Spasm Association. <i>J Am Coll Cardiol<\/i> 2013; 62: 1144\u20131153.","DOI":"10.1016\/j.jacc.2013.07.018"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Seo SM, Kim PJ, Shin DI, Kim TH, Kim CJ, Min JS, et al. Persistent coronary artery spasm documented by follow-up coronary angiography in patients with symptomatic remission of variant angina. <i>Heart Vessels<\/i> 2013; 28: 301\u2013307.","DOI":"10.1007\/s00380-012-0249-2"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. el-Tamimi H, Mansour M, Pepine CJ, Wargovich TJ, Chen H. Circadian variation in coronary tone in patients with stable angina: Protective role of the endothelium. <i>Circulation<\/i> 1995; 92: 3201\u20133205.","DOI":"10.1161\/01.CIR.92.11.3201"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Nihei T, Takahashi J, Tsuburaya R, Ito Y, Shiroto T, Hao K, et al. 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