<prompt> Translate the following text to SwahiliThe two available sources, both authored by Michael Jones-Lee, derive significantly differing adjustment factors, and reflect reflecting the overall uncertainty within the literature about age-specific VSL adjustments.  <response>: Vyanzo viwili vilivyopatikana, vyote vilivyoandikwa na Michael Jones-Lee, vinatokana na sababu tofauti za marekebisho, na kutafakari kutojua kwa ujumla ndani ya fasihi kuhusu marekebisho ya umri wa umri wa umri. 