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Fig. 1 | Health Research Policy and Systems

Fig. 1

From: Health policy and systems research collaboration pathways: lessons from a network science analysis

Fig. 1

Health policy and systems research co-authorship networks from 1990 to 1994 (left panel) and 1990 to 1999 (right panel). Node colour represents the economic classification of first-authors’ country, as per the World Bank. The left inset shows the small disjoint chains (SDC) prior to 1994, where each chain is comprised of authors from the same economic region, and very often, from the same institution. The right inset shows the authors becoming gradually more connected, yet still considered to have SDC structure. There were 378 nodes in 1990–1994 and 1119 nodes in 1990–1999. Orange colour indicates low-income countries (LICs), green for lower middle-income countries (LowerMICs), pink for upper middle-income countries (UpperMICs) and blue for high-income countries (HICs)

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