Flawed comparative groups lead to flawed conclusions

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@article{1ffc60df638b41128d4f62333b86d4cc,

title = "Flawed comparative groups lead to flawed conclusions",

author = "Peter Collignon",

year = "2009",

month = oct,

day = "1",

doi = "10.1378/chest.09-1153",

language = "English",

volume = "136",

pages = "1184--1185",

journal = "Chest",

issn = "0012-3692",

publisher = "Elsevier Inc.",

number = "4",

}