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APA Citation
Maeder, G., Vester, A., Ruybal, D., Torczynski, A., Ebner, M., & Kaldan, G. (2021). how effective is caffeine plus an analgesic compared with analgesic alone for the treatment of acute headache pain in adults?. Evidence-based practice, 24(6), 13–15. http://access.bl.uk/ark:/81055/vdc_100168586366.0x000006