In one embodiment, {TAIL ~ one or more additional sensors} are integrated or coupled to {HEAD ~ a hydration sensor} 
In one embodiment , { TAIL ~ one or more additional sensors } are integrated or coupled to { HEAD ~ a hydration sensor }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD