Community engagement and integrated health and polio immunisation campaigns in conflict-affected areas of Pakistan: a cluster randomised controlled trial oleh Muhammad Atif Habib, MPH, Sajid Soofi, FCPS, Prof Simon Cousens, DipMathStat, Saeed Anwar, MPH, Najib ul Haque, FRCP, Prof Imran Ahmed, MSc, Noshad Ali, MPH, Rehman Tahir, MBA, Prof Zulfiqar A Bhutta, PhD