case_images: PMC4759845_01
case_images: Healthcare referral procedural diagram.
case_images: GHA-9-29964-g001.jpg
case_images: PMC4759845_01_GHA-9-29964-g001.jpg
case_images: F0001
case_images: This grey literature review enabled a good understanding of the operation of the healthcare referral system in the province of Hubei, as expressed in the healthcare referral procedural diagram presented in Fig. 1.