“…These include characteristics of subjects (postpartum women), survey method used (CATI), efforts spent on tracing and recruitment of subjects (field operations), in addition to qualitative and quantitative characteristics of the incentives provided (check and telephone card). Often, the survey method is predetermined by the target population of interest, especially when subjects are health professionals [6,[12][13][14][15]17,19,23]. In other situations, a choice of different survey methods, including telephone [2][3][4]8], mailed [16,20], or direct interview [1] surveys or a combination of these [5,10] could be applied.…”