Mild clinical adverse events including vomiting [ 16.7 % ( N = 5 ) in CH , 6.7 % ( N = 2 ) in CH + P , 6.7 % ( N = 2 ) in CH + H ] , agitation in 3.3 % of CH + P ( N = 1 ) group and mild transient hypotension in 3.3 % of CH + H ( N = 1 ) group occurred .