1. NHS Hyperparathyroidism 2020 https://www.nhs.uk/conditions/hyperparathyroidism (accessed 9 Jun 2020).
2. National Institute for Health and Care Excellence Hyperparathyroidism (primary): diagnosis, assessment and initial management NG132 2019 https://www.nice.org.uk/guidance/ng132 (accessed 9 Jun 2020).