[1] MCGILL UNIV,DEPT EPIDEMIOL & HLTH,MEAKINS CHRISTIE LABS,3775 UNIV ST,MONTREAL H3A 2B4,QUEBEC,CANADA
[2] UNIV MONTREAL,NOTRE DAME HOSP,DIV RESP,MONTREAL H3C 3J7,QUEBEC,CANADA
[3] MCGILL UNIV,ROYAL VICTORIA HOSP,DIV RESP,MONTREAL H3A 1A1,QUEBEC,CANADA
[4] MCGILL UNIV,ROYAL VICTORIA HOSP,DEPT RADIOL,MONTREAL H3A 1A1,QUEBEC,CANADA