[1] DALHOUSIE UNIV,DEPT PHYSIOL,HALIFAX B3H 4H2,NS,CANADA
[2] DALHOUSIE UNIV,DEPT PHYSIOL & BIOPHYS,HALIFAX B3H 4H2,NS,CANADA
[3] DALHOUSIE UNIV,DEPT MED,HALIFAX B3H 4H2,NS,CANADA
[4] VICTORIA GEN HOSP,HALIFAX B3H 2Y9,NS,CANADA
[5] UNIV PARMA,IST FISIOL GEN,I-43100 PARMA,ITALY