Fig. 2From: An observational study protocol to explore loneliness and systemic inflammation in an older adult population with chronic venous leg ulcersConceptual model of Key Study Variables Mapped to Major Concepts of the Psychoneuroimmunological (PNI) Paradigm. Note: Variables included in this model were derived from results of preliminary studies and findings from the scientific literature on loneliness and chronic venous leg ulcersBack to article page