{HEAD ~ The frame} is preferably {TAIL ~ a metallic structure} capable of being tilted to modify the planar position of the bedding without requiring the concurrent repositioning of the patient 
{ HEAD ~ The frame } is preferably { TAIL ~ a metallic structure } capable of being tilted to modify the planar position of the bedding without requiring the concurrent repositioning of the patient
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH