Schoolboy Xiao Gao , five days ago , drank water spiked with perfume and chalk dust . He has not spoken since the prank which went wrong 11 . Doctors ca n't explain sudden voice loss and think it may be psychological .
Schoolboy Xiao Gao , 11 , drank water spiked with perfume and chalk dust . He has not spoken since the prank which went wrong five days ago . Doctors ca n't explain sudden voice loss and think it may be psychological .