Recent trends of ERS in Japan.
Nippon Telegraph and Telephone Corp., Japan.
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D000368:Aged; D003143:Communication Devices for People with Disabilities / Q000600:supply & distribution*; D003625:Data Collection; D003710:Demography; D004631:Emergency Medical Service Communication Systems / Q000458:organization & administration* / Q000706:statistics & numerical data / Q000639:trends; D004867:Equipment Design; D016330:Frail Elderly; D006699:Home Care Services / Q000458:organization & administration; D006801:Humans; D007564:Japan; D010934:Planning Techniques; D017149:Private Sector; D013597:Systems Analysis