Table 1

Questionnaire completed by parents of all children in Yamanashi prefecture as they entered school

Have you ever been diagnosed with any heart disease?
  How old were you when it was first diagnosed?
 What disease(s) have you been diagnosed with?
 What management have you received?
Have you ever had diseases such as chorea, rheumatic fever, Kawasaki disease, hypertension, sepsis, thyroid disease, arthritis?
Have you had any of the following symptoms: fatigue, palpitations, shortness of breath, chest pressure, syncope or faintness?
Do you have any blood relatives who had sudden death younger than 40 years old?