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Description
Perhaps they could tell from the photo

[14] There are different insulin pens for you to choose from some are disposable while some use replaceable insulin cartridges and needles

Chest 129 , 15231530 (2006)

They work well but differ in how they might suit patients
Staying well hydrated helps
Water passes from the intestinal lumen into plasma mainly by passive transport, regulated by osmotic gradients
