TY - GEN AU - Mason,D G TI - Defective anti-reflux valve SN - 0003-2409 PY - 1996///0826 KW - Analgesia, Patient-Controlled KW - instrumentation KW - Equipment Design KW - Equipment Failure KW - Humans N1 - Publication Type: Letter UR - https://doi.org/10.1111/j.1365-2044.1996.tb12591.x ER -