"Source: Steurer, M., Pall, G., Richards, S., Schwarzer, G., Bohlius, J., & Greil, R. (2006). Single-agent purine analogues for the treatment of chronic lymphocytic leukaemia: a systematic review and meta-analysis. Cancer treatment reviews, 32(5), 377-389."
"The authors for the 1996 study, Johnson et al., were listed as  "FCG on CLL" in the original paper by Steurer et al. (2006)."