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There have been many academic papers written about FOP.  Please find some of them below.

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Epidemiology of the Global Fibrodysplasia Ossificans Progressiva (FOP) Community

August 2020

Moira Liljesthröm, Robert J. Pignolo, Frederick S. Kaplan

Abstract:

Background:

Fibrodysplasia Ossificans Progressiva (FOP) is an ultrarare disease, but the geographic distribution and regional prevalence of the condition are unknown. This study was undertaken to determine the emerging global population of FOP patients who were associated with a regional, national or international FOP organization.

Results:

This study interrogated the patient registration database of the International Fibrodysplasia Ossificans Progressiva Association (IFOPA) and those of the 16 regional or national FOP organizations in order to assemble a non-redundant worldwide census of patients living with FOP in 2016 who were associated with a pre-identified FOP community. The total registered population of the global FOP community was 834 individuals [445 females (54%), 387 males (46%), 2 unassigned] distributed in 67 countries and six continents. The apparent prevalence of registered and confirmed FOP patients varied substantially from approximately 0.65 per million in North America, 0.47 per million in Western Europe, and 0.27 per million in Latin America, to 0.05 per million in Africa and nearly 0.04 per million in the Asia-Pacific region.

Conclusions:

The high variability in apparent prevalence is likely associated with lack of awareness of FOP in under-represented medical communities, delay in achieving the correct FOP diagnosis, lack of supporting regional infrastructure and inability of individuals with FOP to reach a local FOP organization or the international FOP community. Emerging knowledge of the apparent prevalence of FOP can serve as a catalyst for resource allotment; physician, patient and community education and outreach; clinical trial recruitment and global networking to achieve a more globally robust and interconnected FOP community.