Section 19. (a) A document of gift shall be valid if executed in accordance with:

(1) this chapter;

(2) the laws of the state or country where it was executed; or

(3) the laws of the state or country where the person making the anatomical gift was domiciled, has a place of residence or was a national at the time the document of gift was executed.

(b) If a document of gift is valid under this section, then this chapter shall govern the interpretation of the document of gift.

(c) A person may presume that a document of gift or amendment of an anatomical gift is valid unless that person knows that it was not validly executed or was revoked.