Mr X was a 45-year-old man with a history of hypertension that was under good control using medication. He worked as a taxi driver for eight hours per day. He smoked one and a half pack of cigarettes per day and had done so for over 20 years. His father died from a heart attack at age 60. He had no signs or symptoms of cardiorespiratory disease. He had just completed a medical check-up and the report showed body height of 173cm and body weight o
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