John, N; Murthy, GV; Vashist, P; Gupta, SK; (2008) Work capacity and surgical output for cataract in the national capital region of Delhi and neighbouring districts of north India. Indian journal of public health, 52 (4). pp. 177-84. ISSN 0019-557X https://researchonline.lshtm.ac.uk/id/eprint/4388 Full text not available from this repository.