In one embodiment of {TAIL ~ the present invention}, {HEAD ~ this ratio} is from about 1:2 to about 4:1 
In one embodiment of { TAIL ~ the present invention } , { HEAD ~ this ratio } is from about 1:2 to about 4:1
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH