Authors' reply to Booth and colleagues.

Competing Interests: Competing interests: SB receives funding for doctoral research from the CanTest collaborative (Cancer Research UK) and is employed as clinical lead for cancer for NHS Leeds clinical commissioning group. The publication costs of a collection of essays on health inequalities which he co-edited for the Fabian Society was funded by the Association of the British Pharmaceutical Industry and Lloyds Pharmacies, but he received no direct funding or payment for this.