Non-availability of ether.
D000328:Adult; D004986:Ether / Q000600:supply & distribution*; D005019:Ethyl Ethers / Q000600:supply & distribution*; D006784:Hospitals, Teaching; D006801:Humans; D008131:London; D008297:Male; D009126:Muscle Relaxation / Q000187:drug effects
D005019:Ethyl Ethers; D004986:Ether