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"CHRN." (n.d.). Fullformexpand.com. Retrieved February 21, 2026, from https://www.fullformexpand.com/chrn/certified-hyperbaric-registered-nurse.
CHRN. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/chrn/certified-hyperbaric-registered-nurse (Accessed: 21 February 2026).