Figure 4.

Rough estimation of the expected number of participants of cross–over study. Letter clipart indicates those expected to complete informed consent and collection of demographic and mobile phone use information; face clipart indicates those expected to complete interviewer–administered face–to–face survey on childhood diarrhoea and pneumonia; mobile phone clipart indicates those expected to complete at least one question from self–administered text messaging survey on childhood diarrhoea and pneumonia. Images were created in Microsoft PowerPoint 2010 or Paint.