I cannot create a summary of the requested article because the search results provided do not contain an article titled "Whose ethics govern global health research?" from the journal Nature Medicine published on February 4, 2026. The search results include information on the WHO guidelines on ethics in health research and research prioritization, as well as on the global health system, but not the specific article you cited. In order to create an accurate and factual summary in Slovak, I would need access to the full text of this particular article.