%0 Generic %B BMJ Open %D 2017 %P e019382 %R 10.1136/bmjopen-2017-019382 %T Retrospective, multicohort analysis of the Clinical Practice Research Datalink (CPRD) to determine differences in the cost of medication wastage, dispensing fees and prescriber time of issuing either short (<60 days) or long (>/=60 days) prescription leng %V 7