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Yasue H, Takizawa A, Nagao M, Nishida S, Horie M, Kubota J, et al. Long-term prognosis for patients with variant angina and influential factors. <i>Circulation<\/i> 1988; 78: 1\u20139.","DOI":"10.1161\/01.CIR.78.1.1"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Nakamura M, Takeshita A, Nose Y. Clinical characteristics associated with myocardial infarction, arrhythmias, and sudden death in patients with vasospastic angina. <i>Circulation<\/i> 1987; 75: 1110\u20131116.","DOI":"10.1161\/01.CIR.75.6.1110"},{"key":"3","unstructured":"3. Sueda S, Kohno H, Oshita A, Izoe Y, Nomoto T, Fukuda H. Vasospastic heart failure: Multiple spasm may cause transient heart failure? <i>J Cardiol<\/i> 2009; 54: 452\u2013459."},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Igarashi Y, Yamazoe M, Suzuki K, Tamura Y, Matsubara T, Tanabe Y, et al. Possible role of coronary artery spasm in unexplained syncope. <i>Am J Cardiol<\/i> 1990; 65: 713\u2013717.","DOI":"10.1016\/0002-9149(90)91376-H"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Sueda S, Kohno H. Impact of pharmacological spasm provocation test in patients with a history of syncope. <i>Heart Vessels<\/i> 2018; 33: 126\u2013133.","DOI":"10.1007\/s00380-017-1046-8"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. 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":"7","doi-asserted-by":"crossref","unstructured":"7. Sueda S, Kohno H, Ochi N. Young 13 year old boy with vasospastic angina. <i>J Jpn Coron Assoc<\/i> 2013; 19: 355\u2013360.","DOI":"10.7793\/jcoron.19.509"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Sueda S, Kohno H, Sakakue T, Higaki T. Acetylcholine test is less sensitive to provoke coronary artery spasm in young rest angina patients: Limitations of single pharmacological spasm provocation tests. <i>J Jpn Coron Assoc<\/i> 2013; 19: 347\u2013354.","DOI":"10.7793\/jcoron.19.13-00029"},{"key":"9","unstructured":"9. Yamaguchi A, Kono T, Nakamura S, Kasano K, Yoshiwara H, Hattori E, et al. A case of 17-year-old men with vasospastic angina and low cardiac systolic function. <i>Heart<\/i> 2019; 51: 430\u2013437 (in Japanese)."},{"key":"10","unstructured":"10. Hasegawa M, Taniguchi K, Sumitomo N, Hirano M, Abe O, Miyashita M, et al. Ventricular fibrillation in a 13 years boy with vasospastic angina. <i>Heart<\/i> 2005; 37: 170\u2013174 (in Japanese)."},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Hosoi T, Koyama Y, Tange S, Sumino H, Kawai Y, Kumakura H, et al. Acute myocardial infarction due to vasospasm in a 13-year-old boy. <i>Jpn Circ J<\/i> 1997; 61: 536\u2013542.","DOI":"10.1253\/jcj.61.536"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Okajima Y, Hirai A, Higashi M, Harigaya K. Vasospastic angina in a 13-year-old female patient whose only symptom was toothache. <i>Pedatr Cardiol<\/i> 2007; 28: 68\u201371.","DOI":"10.1007\/s00246-006-1374-4"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Fukuda N, Kurokawa S, Maeda K, Iseki S, Takahashi M, Niwano H, et al. A young girl with vasospastic angina associated with mutation in endothelial nitric oxide synthase gene: A case report. <i>Angiology<\/i> 2003; 54: 233\u2013237.","DOI":"10.1177\/000331970305400214"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Ivy D, Kaye J, Flitter D, Wiggins J. Variant angina in an adolescent. <i>Pediatr Cardiol<\/i> 1994; 15: 45\u201347.","DOI":"10.1007\/BF00797007"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Kobayashi K, Kozuma R, Tsutsui M, Okazaki M, Tasaki H, Nakamura Y. Vasospastic angina in a 16-year-old female: Report of the youngest female patient and review of the literature. <i>Circ J<\/i> 2004; 67: 467\u2013469.","DOI":"10.1253\/circj.67.467"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Wilkes D, Donner R, Black I, Carabello BA. Variant angina in an 11 year old boy. <i>J Am Coll Cardiol<\/i> 1985; 5: 761\u2013764.","DOI":"10.1016\/S0735-1097(85)80409-5"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Karaaslan S, Baysal T, Baspinar O, Oran B. Adolescent with variant angina. <i>Pediatr Int<\/i> 2003; 45: 478\u2013480.","DOI":"10.1046\/j.1442-200X.2003.01760.x"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Li JJ, Chu JM, Zhang CY. Variant angina in a 17-year-old male. <i>Acta Cardiol<\/i> 2005; 60: 69\u201371.","DOI":"10.2143\/AC.60.1.2005054"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Jefferies L, Tristman B. Prinzmetal in a teenage girl. <i>Pediatr Cardiol<\/i> 2005; 26: 486\u2013487.","DOI":"10.1007\/s00246-004-0811-5"},{"key":"20","unstructured":"20. Mori T, Takehara K, TanakaK, Hiura M, Kitano K, Nakaima O, et al. Acute myocardial infarction in teenagers: Two case reports. <i>J Cardiol Jpn Ed<\/i> 2008; 1: 159\u2013163 (in Japanese)."},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Odanaka Y, Okumura K, Ozaki N, Kishi K, Mori Y, Katayama H, et al. Coronary spastic angina in two pediatric patients. <i>Pediatr Cardiol Cardiac Surg<\/i> 2011; 28: 56\u201364.","DOI":"10.9794\/jspccs.28.56"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Sueda S, Kohno H, Oshita A, Fukuda H, Kondou T, Yano K, et al. Coronary abnormal response has increased in Japanese patients: Analysis of 17 years\u2019 spasm provocation tests in 2093 cases. <i>J Cardiol<\/i> 2010; 55: 354\u2013361.","DOI":"10.1016\/j.jjcc.2009.12.011"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Nakayama M, Yasue H, Yoshimura M, Shimasaki Y, Kugiyama K, Ogawa H, et al. 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