[1] Univ Glasgow, BHF Glasgow Cardiovasc Res Ctr, Glasgow, Lanark, Scotland
[2] Gartnavel Royal Hosp, Dept Biochem, Glasgow, Lanark, Scotland
[3] Glasgow Royal Infirm, Glasgow G4 0SF, Lanark, Scotland
[4] Univ Glasgow, Robertson Ctr Biostat, Glasgow, Lanark, Scotland
[5] Golden Jubilee Natl Hosp, Scottish Natl Adv Heart Failure Serv, Glasgow, Lanark, Scotland