Upon being presented with a declaration, a physician or other provider shall make the declaration a part of the principal’s medical record. When acting under authority of a declaration, a physician or provider must comply with it to the fullest extent possible, consistent with reasonable medical practice, the availability of treatments requested, and applicable law. If the physician or other provider is unwilling at any time to comply with the declaration, the physician or provider may withdraw from providing treatment consistent with the exercise of independent medical judgment and must promptly notify the principal and the attorney-in-fact and document the notification in the principal’s medical record.