(a) A written advance health care directive or similar instrument executed in another state or jurisdiction in compliance with the laws of that state or jurisdiction or of this state, is valid and enforceable in this state to the same extent as a written advance directive validly executed in this state.
(b) In the absence of knowledge to the contrary, a physician or other health care provider may presume that a written advance health care directive or similar instrument, whether executed in another state or jurisdiction or in this state, is valid.