RT Journal Article SR Electronic T1 CONCOMITANT STRABISMUS AND HETEROPHORIA JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 581 OP 588 DO 10.1136/bjo.12.11.581 VO 12 IS 11 A1 Smith, Kenneth R. YR 1928 UL http://bjo.bmj.com/content/12/11/581.abstract AB