Effectiveness of cataract surgery in Barcelona, Spain site results of an international study. Barcelona I-PORT investigators. International Patient Outcomes Research Team.
J Clin Epidemiol. 1998 Oct;51(10):843-52. doi: 10.1016/s0895-4356(98)00067-5.
J Clin Epidemiol. 1998.
PMID: 9762877
Clinical Trial.