?:definition
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Veterans Administration Lung Study Group (VALG) (Staging small cell lung cancer: Veterans Administration Lung Study Group versus International Association for the Study of Lung Cancer--what limits limited disease? Micke P, Faldum A, Metz T, Beeh K.-M, Bittinger F, Hengstler J.-G, Buhl R, Lung Cancer 2002;37:271-276).
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