Ren, W., Mi, D., Yang, K., Cao, N., Tian, J., Li, Z. and Ma, B. 2013. The expression of hypoxia-inducible factor-1α and its clinical significance in lung cancer: a systematic review and meta-analysis. Swiss Medical Weekly. 143, 3536 (Aug. 2013), w13855. DOI:https://doi.org/10.4414/smw.2013.13855.