Cardiologist Dr Akmal Waheed and his brother Dr Arshad Waheed filed an appeal in Sindh High Court on Friday, challenging their conviction by an Anti-Terrorism Court (ATC) on charges of harbouring activists of Jundullah and providing them with medical assistance. The ATC-II had on March 14 sentenced both doctors to seven years in jail, besides imposing a fine of Rs180,000 on each of them.