you know thats the first time ive ever heard some one ask that.. i never gave it any thought.. i guess it's one of those things that every one has taken for granted you know if it works dont fix it kinda thing.. but it would be nice if there are any med students or doctors on the board who knew that and would be willing to share the knowledge with rest of us i still cant believe i never thought of that before. that is deff the best ? ive seen here in a while