[1] Royal Infirm Edinburgh NHS Trust, Dept Renal Med, Edinburgh, Midlothian, Scotland
[2] Univ Edinburgh, Queens Med Res Inst, Ctr Cardiovasc Sci, Edinburgh, Midlothian, Scotland
[3] NHS Educ Scotland, Edinburgh, Midlothian, Scotland
[4] NHS Educ Scotland, South East Scotland GP Programme, Edinburgh, Midlothian, Scotland