“…Most articles (25/31, 81%) used texting, mobile instant messaging, or SMS text messaging to provide continuing education content either as a stand-alone intervention or in addition to other digital learning tools and blended learning formats (eg, coupling SMS text messaging with traditional face-to-face learning) [ 8 , 15 - 17 , 30 - 38 , 40 , 41 , 43 , 45 , 46 , 48 - 52 , 55 , 56 ]. WhatsApp was the most commonly used platform among the studies that used messaging services (17/31, 55%) [ 8 , 15 , 30 - 34 , 36 , 37 , 43 , 46 , 48 , 50 - 52 , 55 , 56 ]. Telephone calls were included in 16% (5/31) of the studies and were primarily used between students and mentors to discuss and reinforce learning content and for students to obtain feedback from mentors [ 16 , 41 , 45 , 46 , 53 ].…”