Khan, MI; Sahito, SM; Khan, MJ; Wassan, SM; Shaikh, AW; Maheshwari, AK; Acosta, CJ; Galindo, CM; Ochiai, RL; Rasool, S; +9 more... Peerwani, S; Puri, MK; Ali, M; Zafar, A; Hassan, R; von Seidlein, L; Clemens, JD; Nizami, SQ; Bhutta, ZA; (2006) Enhanced disease surveillance through private health care sector cooperation in Karachi, Pakistan: experience from a vaccine trial. Bulletin of the World Health Organization, 84 (1). pp. 72-7. ISSN 0042-9686 https://researchonline.lshtm.ac.uk/id/eprint/10276