1. Measuring vitamin D levels: surrogates are insufficient. Issue 1 (31st October 2014) Authors: Heald, A. H.; Anderson, S. G.; Scargill, J. J.; Short, A. D.; Holland, D.; Livingston, M.; Fryer, A. A.; Donn, R. P. Journal: International journal of clinical practice Issue: Volume 69:Issue 1(2015) Page Start: 131 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗