New Delhi, Jan. 3: A doctors’ network today asked the government’s medical price control agency to cap the profit margins for coronary stents at 20 per cent, expressing concerns about what the network says are “huge profits” in the device industry’s supply chain. The Alliance of Doctors for Ethical Care has also told the National Pharmaceutical Pricing Authority to calculate the actual cost of manufacture of stents – devices used to treat patients with heart disease – in regulating their prices.