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