Table 1. Category of radiotherapy institution.

Institution category
U:  University hospital
G:  Cancer center (including national centers)
N:  National hospital organization (excluding cancer centers)
P:  Public hospital (excluding cancer centers)
O:  Red cross hospital, saiseikai hospital, company hospital, public corporation hospital, national health insurance hospital, social insurance hospital, mutual insurance hospital, industrial accident hospital, association hospital and Japan agricultural co-operatives hospital
H:  Medical corporation hospital, medical association hospital, private hospital and other hospital