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"HG." (n.d.). Fullformexpand.com. Retrieved February 20, 2026, from https://www.fullformexpand.com/hg/haemoglobin-hb-is-generally-preferred.
HG. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/hg/haemoglobin-hb-is-generally-preferred (Accessed: 20 February 2026).