The day started like any other for 82-year-old Lau Sung Pong. He went missing for six days and was found on the roof of an HDB block. SINGAPORE: Every day without fail, 82-year-old Lau Sung Pong would leave his home in Braddell Heights at 10am and follow a routine he had been going at alone for years. With only an umbrella-walking stick and a bag, the elderly man would make his way to Cheng San food market in Ang Mo Kio, then to Chinatown, all via public transport, before returning home. But in