Learning from the surgeon’s real perspective - first-person view versus laparoscopic view in e-learning for training of surgical skills?: study protocol for a randomized controlled trial - Schmidt, Mona Wanda; Friedrich, Mirco; Kowalewski, Karl-Friedrich; Garza, Javier Rodrigo de la; Bruckner, Thomas; Müller, Beat P.; Nickel, Felix (International journal of surgery protocols, 2017)