[1] Case Western Reserve Univ, Cleveland, OH 44106 USA
[2] Bnai Zion Med Ctr Israel, Haifa, Israel
[3] Univ Hosp, Mannheim, Germany
[4] Med Coll Wisconsin, Milwaukee, WI 53226 USA
[5] Somnolab Dortmund, Dormund, Germany
[6] Hennepin Cty MC, Minneapolis, MN USA
[7] Detroit Med Ctr, Detroit, MI USA
[8] Univ Antwerp Hosp, Antwerp, Belgium