The world of pulmonary vascular disease (PVD) is lopsided in this sense: those nations that have the highest numbers of PVD researchers have the lowest number of PVD patients.
We ran a PubMed search for PVD researchers and found that, of all the authors of published articles on PVD, 90.3% were from the United States, Canada, the United Kingdom, France, Germany and Japan, while those from all the rest of the world totaled only 9.7% (Fig. 1). Meanwhile, schistosomiasis is very rare in North America, but is the most common cause of pulmonary hypertension worldwide. In addition, the burden of HIV-related pulmonary hypertension is likely to be far greater in Africa.