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APA Citation
Schünemann, H., Tugwell, P., Reeves, B., Akl, E., Santesso, N., Spencer, F., Shea, B., Wells, G., & Helfand, M. (n.d.). 059 Nonrandomised Studies as a Source of Complementary, Sequential or Replacement Evidence for Randomised Controlled Trials in Systematic Reviews and Guidelines. BMJ quality & safety, 22, A31. http://access.bl.uk/ark:/81055/vdc_100135141484.0x000005