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"PTPY." Fullformexpand.com, https://www.fullformexpand.com/ptpy/per-thousand-patient-years. Accessed 25 Feb. 2026.
Fullformexpand.com, 2026. "PTPY." Accessed February 25, 2026. https://www.fullformexpand.com/ptpy/per-thousand-patient-years.
"PTPY." (n.d.). Fullformexpand.com. Retrieved February 25, 2026, from https://www.fullformexpand.com/ptpy/per-thousand-patient-years.
PTPY. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/ptpy/per-thousand-patient-years (Accessed: 25 February 2026).