4WHO Collaborating Centre for Drug Statistics Methodology. ATC/DDD Index 2013 [EB/OL]. 2013-12-19 [2014-09-10]. http://www.whocc.no/atc_ddd_ index/.
5XIAO Y X, LI D, XIE S X, et al. Studying rational use of pediatric prescribed drugs in outpatient department in accordance with international indicators and DDDs sequences analysis [J]. J China Pharm(中国药房), 2006, 17(18): 1388-1390.