Hospital offers free lifeline to millions

Camped on the baking concrete outside a gleaming transplant center, Karachi's sick have come from miles around in desperate hope for a last chance at life.

There, Dr Adibul Rizvi provides free medical care to hundreds of thousands of people each year, providing a much-needed alternative to Pakistan's public health sector, which critics dismiss as chaotic, corrupt and vastly under-resourced.

Rizvi, with a thatch of white hair as springy as his step, roams the crowded halls of his life's work every day from 8 am until midnight or later, visiting the bedsides of patients - children, criminals, VIPs alike.