<prompt> Translate the following text to EnglishHivi karibuni, masomo kadhaa mapya ya muda mrefu yamechapishwa ambayo hutumia mbinu zilizoboreshwa na yanaonekana kuwa sawa na mwili wa awali wa fasihi.  <response>: More recently, several new, long-term studies have been published that use improved approaches and appear to be consistent with the earlier body of literature. 