RIYADH: Volunteer medical staffers of Saudi Arabia’s aid agency KSrelief have been carrying out cardiac surgery and catheterization for children and adults at Prince Mohammed bin Salman Hospital in Aden, Yemen. The project began on May 4 and ends May 15, with 25 volunteers working with the Saudi Development and Reconstruction Program for Yemen. The medical workers performed 166 catheterization procedures and 25 open-heart operations. The assistance is a part of KSrelief’s worldwide relief and humanitarian projects.