TY - RPRT TI - Cervical orthoses. A study comparing their effectiveness in restricting cervical motion in normal subjects. AU - R M Johnson AU - D L Hart AU - E F Simmons AU - G R Ramsby AU - W O Southwick PY - 1977 UR - https://pubmed.ncbi.nlm.nih.gov/849944/ ID - 849944 ER -