Enhanced disease surveillance through private health care sector cooperation in Karachi, Pakistan: Experience from a vaccine trial

Mohammad Imran Khan, Shah Muhammad Sahito, Mohammad Javed Khan, Shafi Mohammad Wassan, Abdul Wahab Shaikh, Ashok Kumar Maheshwari, Camilo J. Acosta, Claudia M. Galindo, Rion Leon Ochiai, Shahid Rasool, Sheeraz Peerwani, Mahesh K. Puri, Mohammad Ali, Afia Zafar, Rumina Hassan, Lorenz Von Seidlein, John D. Clemens, Shaikh Qamaruddin Nizami, Zulfiqar A. Bhutta