79399B89-891D-4F44-A6F7-AA993BDCF417Can instrumental variable analysis overcome confounding by indication? Validation of physicians' prescribing preferences as instrumental variables.Research GrantMR/N01006X/1C008C651-F5B0-4859-A334-5F574AB6B57CMRCINCOME_ACTUAL904351A58AB02-5719-4B5F-A2EB-DFF62BB580F6What is the effect of varenicline on long-term smoking abstinence in primary care patients?1d8f8042ca2049a5c24361cf343c3355Davies NM2016-01-01Conference/Paper/Proceeding/Abstract58b54ba32047c8.74299052