Thompson, RL; Summerbell, CD; Hooper, L; Higgins, JP; Little, PS; Talbot, D; Ebrahim, S; (2003) Relative efficacy of differential methods of dietary advice: a systematic review. The American journal of clinical nutrition, 77 (4 Supp). 1052S-1057S. ISSN 0002-9165 https://researchonline.lshtm.ac.uk/id/eprint/12674 Full text not available from this repository.