For Peer Review                                !"  # $# %& ’! ( ) $# *+ ,- ! ) , #, " #! ,!+ . /0 ) "+ $ 10  &+ .+ (# !1+ -  ) *!" #+ . /0 ) "+ 20 3+ .+ (#- ! ) #!,+ . /0 ) "+ $10 &+ .+ (# 4+ 0-  ) *!" #+ . /0 ) "+ 20 3+ .+ (#- ! ) , #, " #! ,!+ . /0 ) "+ $ 10  &+ .+ (# *+ -  ) *!" #+ . /0 ) "+ 20 3+ .+ (#- ! ) *#!+ . /0 ) "+ $ 10  &+ .+ (# *+ 5"-  ) *!" #+ . /0 ) "+ 20 3+ .+ (# 01+ $- ! ) , #, " #! ,!+ . /0 ) "+ $ 10  &+ .+ (# 1+ $")-  ) *!" #+ . /0 ) "+ 20 3+ .+ (# .6" ’, ) 7+ # !#"+ 7"0 ##+ )0" http://mc.manuscriptcentral.com/ptr Phytotherapy Research peer-00483245, version 1 - 13 May 2010 Author manuscript, published in "Phytotherapy Research 23, 12 (2009) 1701-n/a" DOI : 10.1002/ptr.2815