Drupal-Bibcite0<style face="normal" font="default" size="100%">Multilevel analysis of trachomatous trichiasis and corneal opacity in Nigeria: The role of environmental and climatic risk factors on the distribution of disease.</style><style face="normal" font="default" size="100%">Multilevel analysis of trachomatous trichiasis and corneal opacity in Nigeria: The role of environmental and climatic risk factors on the distribution of disease.</style>