Enhanced disease surveillance through private health care sector cooperation in Karachi, Pakistan : experience from a vaccine trial by MOHAMMAD IMRAN KHAN, SHAH MUHAMMAD SAHITO, PEERWANI, Sheeraz, PURI, Mahesh K, ALI, Mohammad, ZAFAR, Afia, HASSAN, Rumina, VON SEIDLEIN, Lorenz, CLEMENS, John D, SHAIKH QAMARUDDIN NIZAMI, RHUTTA, Zulfiqar A, MOHAMMAD JAVED KHAN, SHAFI MOHAMMAD WASSAN, ABDUL WAHAB SHAIKH, ASHOK KUMAR MAHESHWARI, ACOSTA, Camilo J, GALINDO, Claudia M, OCHIAI, Rion Leon, RASOOL, Shahid

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