Calcium metabolism
Hypercalcemia
WikEM overview of hypercalcemia: https://www.wikem.org/wiki/Hypercalcemia
LITFL overview of hypercalcemia: http://lifeinthefastlane.com/ccc/hypercalcaemia/
LITFL investigation of hypercalcemia: http://lifeinthefastlane.com/investigations/hypercalcaemia/
ECG changes in hypercalcemia: http://lifeinthefastlane.com/ecg-library/basics/hypercalcaemia/