Key references: Muscle cramps, including leg cramps in pregnant women

El-Tawil S, Al Musa T, Valli H, Lunn MP, Brassington R, El-Tawil T, et al. Quinine for muscle cramps. Cochrane Database Syst Rev 2015;(4):CD005044. https://www.ncbi.nlm.nih.gov/pubmed/25842375
Garrison SR, Allan GM, Sekhon RK, Musini VM, Khan KM. Magnesium for skeletal muscle cramps. Cochrane Database Syst Rev 2012;(9):CD009402. https://www.ncbi.nlm.nih.gov/pubmed/22972143
Zhou K, West HM, Zhang J, Xu L, Li W. Interventions for leg cramps in pregnancy. Cochrane Database Syst Rev 2015;(8):CD010655. https://www.ncbi.nlm.nih.gov/pubmed/26262909