Table 5.

Types of e-learning interventions used in included studies

E-learning interventions used in included studies	Studies
Web-based software/platform	Cruz 2014, Meckfessel 2011, Mileman 2003 Nilsson 2007, Nkenke 2012, Vuchkowa 2011 and Vuchkowa 2012
Interactive modules with MCQ (self-assessment tests)/quizzes/matching questions	Busanello 2015, Tsao 2016 and Silveira 2008
Interactive animations with videos	Al-Rawi 2007, Howerton 2002, 2004 and Silveira 2009
Narrated PP lectures	Tan 2009
Online word documents/notes	Kavadella 2012
Emails containing MCQs and an additional email including the correct answers	Nkenke 2012