$1'2>!<x!]1!:`!9%!L~!O((B1 = s Medi quest : $1'2>!<x!]1!<Q(B1 / s - $1!JN!`@!3K!JH!S43=T!C\!^v!3'!5-s ($1!T+!4I!<Ds $1!JN!`@!3K!JH!S43=T!C\!^v!3'!5-s, 1997)