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APA Citation
Freeman, S., Cooper, N., Sutton, A., Crowther, M., Carpenter, J., & Hawkins, N. (n.d.). oP236 Evidence Synthesis Of Time-To-Event Outcomes In The Presence Of Non-Proportional Hazards. International journal of technology assessment in health care, 37, 8. http://access.bl.uk/ark:/81055/vdc_100146339149.0x000042