Such tests can be utilized advantageously not only by clinicians, hospitals, reference laboratories, and public health facilities, but also by {HEAD ~ field workers} in {TAIL ~ under and undeveloped areas} throughout the world 
in
Such tests can be utilized advantageously not only by clinicians , hospitals , reference laboratories , and public health facilities , but also by { HEAD ~ field workers } in { TAIL ~ under and undeveloped areas } throughout the world
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH