{HEAD ~ The velocity} of {TAIL ~ blood cells} in skin or other tissue capillaries is determined by a laser Doppler technique 
{ HEAD ~ The velocity } of { TAIL ~ blood cells } in skin or other tissue capillaries is determined by a laser Doppler technique
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH