If we allow for 'not mainstream medicine', why then are they stopping at those three? Why not include the spells and potions that might include pepper? Why not the treatments you or I could just make up on the spot in a work of fiction? If we expand the definition of medicine to include nonsense, the term would lose all meaning. As a society we demand medicine be 'things proven to work' and all those things they list are not part of that set; they have not been proven to work, and thus not included in 'medicine'. If they were in fact proven to work, they would simply be part of mainstream medicine.