 የጥናቱ ምንነት እና አጠቃላይ አላማ ማብራሪያ ከተደረገላቸው በኋላ ፈቀደኝነታቸውን ተጠይቀው ፈቃደኛ የሆኑት ብቻ እንዲሳተፉ ተደርጓል።
The objective of the study was explained for every participant and was asked to give information only after they give their consent.