It was suggested that evidence that interventions have had a positive impact on the population is more likely to emerge in narrowly defined areas such as increasing immunization rates or decreasing workplace smoking.
(interventions; have had; a positive impact on the population) (evidence that interventions have had a positive impact on the population; to emerge; L:in narrowly defined areas such as increasing immunization rates or decreasing workplace smoking)
interventions evidence that interventions have had a positive impact on the population
have had to emerge
a positive impact on the population
L:in narrowly defined areas such as increasing immunization rates or decreasing workplace smoking