The heterogeneous 🌍🌎🌏 world prevalence of systemic #lupus reflects heterogeneity in: ➡️ Ethnic mix ➡️ Genetic background ➡️ Age & sex ➡️ Year of the study ➡️ Socio-economic factors ➡️ Epidemiological methods ➡️ Environmental factors (?) Across populations https://t.co/QMJbJUf3vD