Frontmatter : Barriers to New Competition Their Character and Consequences in Manufacturing Industries REPRODUCIBILITY AND VALIDITY OF A SEMIQUANTITATIVE FOOD FREQUENCY QUESTIONNAIRE The effect of angiotensin-converting-enzyme inhibition on diabetic nephropathy. The Collaborative Study Group. Randomised trial of interferon alpha2b plus ribavirin for 48 weeks or for 24 weeks versus interferon alpha2b plus placebo for 48 wee... Cigarette smoking, relative weight, and menopause Randomised trial of interferon [alpha]2b plus ribavirin for 48 weeks or for 24 weeks versus interferon [alpha]2b plus placebo for 48... The selectivity of protein kinase inhibitors: a further update. The amphibian tree of life Physical signs for the general dental practitioner. Case 82. Congestive (cardiac) heart failure Familial breast cancer: collaborative reanalysis of individual data from 52 epidemiological studies including 58 209 women with bre...