The Green Mountain Care Board voted Wednesday morning to approve the all-payer waiver, giving the go-ahead for the state to implement a model the governor says will curb rising health care costs. Gov. Peter Shumlin has been travelling the state in recent weeks to promote the initiative. Under an all-payer model, providers are paid set amounts for care, rather than being paid per test, service or procedure. Al Gobeille, the chairman of the Green Mountain Care Board, said the new way of paying health care providers will save Vermont $10 billion over the next 10 years.