Hong Kong stocks retreat ahead of China trade data, index in correction territory

　　China imports are estimated to have expanded 4.7 per cent last month, versus a 1.9 per cent contraction in March, with exports also seen returning to expansion territory

　　The Hang Seng Index lost 0.4 per cent to 18,410.20 at the local noon trading break, after gaining as much as 0.7 per cent early in the day