The data extracted from the questionnaires were entered into a matrix in Microsoft Excel and processed in EpiInfo version 5.0 and Stata. 
Microsoft Excel
The data extracted from the questionnaires were entered into a matrix in Microsoft Excel and processed in EpiInfo version 5.0 and Stata. 
EpiInfo version 5.0
The data extracted from the questionnaires were entered into a matrix in Microsoft Excel and processed in EpiInfo version 5.0 and Stata. 
Stata