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Johnson BE, Crawford J, Downey RJ, Ettinger DS, Fossella F, Grecula JC, Jahan T, Kalemkerian GP, Kessinger A, Koczywas M, Langer CJ, Martins R, Marymont MH, Niell HB, Ramnath N, Robert F, Williams CC, National Comprehensive Cancer Network (NCCN). Small cell lung cancer clinical practice guidelines in oncology. J Natl Compr Canc Netw. 2006 Jul;4(6):602–622.