We used Google Trends (GT) to identify and analyze course over time and regional interest of seven topics: "Chest pain", "Cyanosis", "Edema", "Orthopnea", "Palpitation", "Shortness of breath", "Syncop
*Australian population data from the Australian Bureau of Statistics 2011 Census;** High school normally completed at age 17;*** Not in labour force (e.g. student, retired)Characteristics of survey re
