[1] Merck Schering Plough, Whitehouse Stn, NJ USA
[2] Univ Palermo, Palermo, Italy
[3] Point Med Rond Point Nat, Dijon, France
[4] St Jan Hosp, Brugge, Belgium
[5] Fac Med, Olomouc, Czech Republic
[6] Univ Hosp Olomouc, Olomouc, Czech Republic
[7] Tallinn Univ Technol, North Estonia Reg Hosp, EE-200108 Tallinn, Estonia
[8] Merck Res Labs, Rahway, NJ USA