KARACHI: One of the senior most child specialists of the country, Prof Nizam ul Hasan passed away here on Wednesday, leaving behind a widow, Dr Razia Hasan, and thousands of children who managed to survive against cancer due to tireless efforts of the selfless soul and his team. Dr Nizam ul Hasan born in 1931, was a Dow graduate who did his specialization in paediatrics from UK and returned back to the country, in 1950s, joining the children department at Jinnah Hospital (later upgraded as Jinnah Post Graduate Medical Centre).—APP