Anytime you interfere with a natural process, you're playing God. God determines what happens naturally. That means when a person's ill, he shouldn't go to a doctor because he's asking for interference with God's will. But of course, patients can't think that way.
“As a medical doctor, it is my duty to evaluate the situation with as much data as I can gather and as much expertise as I have and as much experience as I have to determine whether or not the wish of the patient is medically justified.”