[1] Hosp Sick Children, Res Inst, Toronto, ON M5G 1X8, Canada
[2] Univ Toronto, Dept Publ Hlth Sci, Toronto, ON, Canada
[3] Univ Toronto, Dept Pharmacol, Toronto, ON, Canada
[4] Hosp Duran & Reynals, Med & Mol Genet Ctr, IRO, Barcelona 08907, Catalonia, Spain
[5] CHU Brest, UBO, ETSBO, Ctr Bioenet, Brest, France
[6] Johns Hopkins Univ, Sch Med, Dept Pediat, Baltimore, MD 21287 USA
[7] Univ Hosp Prague Motol, Inst Biol & Med Genet, Dept Mol Genet, CF Ctr, CZ-15006 Prague 5, Czech Republic
[8] St Vincents Hosp & Med Ctr, Cyst Fibrosis Ctr, New York, NY 10011 USA
[9] Univ Utah, Intermt Cystic Fibrosis Ctr, Salt Lake City, UT 84132 USA
[10] Inst Biol, Lab Biochem Genet, F-34060 Montpellier, France
[11] Ctr Anal Genet, Zaragoza, Spain
[12] Inst Mother & Child, Dept Genet, PL-01211 Warsaw, Poland
[13] Univ Toronto, Dept Pediat, Toronto, ON, Canada
[14] Univ Toronto, Dept Mol & Med Genet, Toronto, ON, Canada