1. British Heart Foundation Cardiovascular Research Centre; University of Glasgow; 126 University Place Glasgow G12 8TA UK
2. Department of Biochemistry; Gartnavel General Hospital; Glasgow UK
3. Department of Cardiology; Glasgow Royal Infirmary; Glasgow UK
4. Robertson Centre for Biostatistics; University of Glasgow; Glasgow UK
5. Scottish National Advanced Heart Failure Service; Golden Jubilee National Hospital; Glasgow UK