RT Journal Article SR Electronic T1 There has to be a better way: evolution of internal filtration glaucoma surgeries JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 1228 OP 1229 DO 10.1136/bjophthalmol-2013-303237 VO 97 IS 10 A1 Loewen, Nils A A1 Schuman, Joel S YR 2013 UL http://bjo.bmj.com/content/97/10/1228.abstract AB