Ten people are in a serious condition in hospital after overdosing on the party drug known as Grievous Bodily Harm (GBH) during a Melbourne rave early today.Metropolitan Ambulance Service spokesman James Howe said paramedics were repeatedly called to the dance party at Melbourne's Rod Laver Arena from 1am (AEDT) until 8am today following reports people had collapsed unconscious after taking GBH."Nine people, aged in their 20s and 30s, were taken to various Melbourne hospitals throughout the night," Mr Howe said.Another man, in his 20s, was in a critical condition in the Alfred hospital but later stabilised."Upon arrival at various intervals...