Data were summarized using the Survey Monkey program , then exported to Excel .
Data were analyzed using Stata statistical package ( Intercooled Stata Version 9.2 ; StataCorp LP , College Station , Texas ) .
Data were summarized using the Survey Monkey program , then exported to Excel , and analyzed using Stata statistical package ( Intercooled Stata Version 9.2 ; StataCorp LP , College Station , Texas ) .