Figure 3.

Research funding sources that centers reported, starting from the left with National Institutes of Health (research project support [R01]), program project grant (PPG), mentored research grants (K-series), other NIH grant mechanisms (Other NIH), National Science Foundation (NSF), private foundations (PF), American Academy of Sleep Medicine or Sleep Research Society (AASM/SRS), National Defense and NASA funds (DOD/NASA), industry-sponsored investigator-initiated research (IIR), industry-initiated research such as clinical trials (Industry), and other sources including donations and other forms of institutional grants (Other).