Fig. 1
From: Procedural analgesic interventions in China: a national survey of 2198 hospitals
Number of questionnaires submitted and proportion of procedural analgesic interventions centers distributed in each region. (A) Number of questionnaires submitted by each region. (B) Proportion of procedural analgesic interventions centers by each region. (C) Population’s surveying ratio of Grade III hospitals. (D) Population’s surveying ratio of Grade II hospitals