UpToDate: Calcium requirements in adolescents. uptodate.com/contents/calcium-requirements-in-adolescents.
264
National Health Service: Water, drinks and your health. nhs.uk/Livewell/Goodfood/Pages/water-drinks.aspx.
265
UpToDate: Medical management of gastroesophageal reflux disease in adults. uptodate.com/contents/medical-management-of-gastroesophageal-reflux-disease-in-adults.