TY - GEN AU - Wright,B M TI - Hazard of nitrous oxide cryosurgery SN - 0007-1447 PY - 1980///0722 KW - Air Pollution KW - prevention & control KW - Cryosurgery KW - Nitrous Oxide N1 - Publication Type: Letter UR - https://doi.org/10.1136/bmj.280.6213.569-a ER -