Reply. Issue 4 (April 2017) - Papaioannou, Theodore G.; Karageorgopoulou, Theofani D.; Sergentanis, Theodoros N.; Protogerou, Athanase D.; Psaltopoulou, Theodora; Sharman, James E.; Weber, Thomas; Blacher, Jacques; Daskalopoulou, Stella S.; Wassertheurer, Siegfried; Khir, Ashraf W.; Vlachopoulos, Charalambos; et al.