Estimation of the optimum dose of vitamin D for disease prevention in older people: Rationale, design & baseline characteristics of the BEST-D trial.
Robert Clarke, Connie Newman, Joseph Tomson, Harold Hin, Rijo Kurien, Jolyon Cox, Michael Lay, Jenny Sayer, Michael Hill, Jonathan Emberson, Jane Armitage. Maturitas (International journal of midlife health and beyond); doi:10.1016/j.maturitas.2015.01.013

Vitamin D and risk of death from vascular and non-vascular causes in the Whitehall study and meta-analyses of 12 000 deaths.
Joseph Tomson, Jonathan Emberson, Michael Hill, Andrew Gordon, Jane Armitage, Martin Shipley, Rory Collins, Robert Clarke; European Heart Journal 2012; doi: 10.1093/eurheartj/ehs426