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Seven types of symptom episodes were investigated including VCD, asthma, and panic episodes; and co-occurring or combined episodes of VCD and asthma; VCD and panic; asthma and panic; and VCD, asthma, and panic. The variability and complexity of the participant\u2019s symptom episodes, which are described, led to the development of a new VCD\/asthma\/panic comorbidities symptom classification system.<\/jats:p>","DOI":"10.1177\/10573802011003007","type":"journal-article","created":{"date-parts":[[2003,7,19]],"date-time":"2003-07-19T02:59:46Z","timestamp":1058583586000},"page":"324-340","source":"Crossref","is-referenced-by-count":6,"title":["A Case Study of Comorbidities"],"prefix":"10.1177","volume":"11","author":[{"given":"Wendy A.","family":"Heffern","sequence":"first","affiliation":[{"name":"Alberta Mental Health Board"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Terry M. 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