“…It was therefore considered particularly important to identify all studies on the topic, including those by researchers with no commercial interest in the instruments. Notably, no copyright holder of the applied instruments was among the authors of the two papers that reported nonsignificant results (Abbiati et al, 2012;Devore, Nandur, & Manning, 1984) (for details see Figure 2, Paper 1). However, as three other studies (Clark et al, 2012;Jelčić Jakšić, 2012;(Leahy & Loftus, 1998) by non-copyright holders reported significant differences between groups, it seems unlikely that biased inferences were drawn.…”