1. Handbook on Clinical Practice Guidelines;Davis,2007
2. Transforming clinical practice guidelines into legislative mandates. Proceed with abundant caution;Jacobsen;JAMA,2007
3. Global data on visual impairment in the year 2002;Resnikoff;Bull World Health Organ,2004
4. National Physician Database,2005
5. Cost-utility analysis of cataract surgery in the second eye;Busbee;Ophthalmology,2003