Limitations of reverse-transcriptase polymerase chain reaction analyses for detection of micrometastatic epithelial cancer cells in bone marrow. - Zippelius,A.; Kufer,P.; Honold,G.; Kollermann,M.W.; Oberneder,R.; Schlimok,G.; Riethmuller,G.; Pantel,K. (J Clin Oncol, 1997)