Drupal-Bibcite0<style face="normal" font="default" size="100%">Understanding the importance of non-material factors in retaining community health workers in low-income settings: a qualitative case-study in Ethiopia.</style><style face="normal" font="default" size="100%">Understanding the importance of non-material factors in retaining community health workers in low-income settings: a qualitative case-study in Ethiopia.</style>