There are many other certificate programs out there and unfortunately some of these can be confusing even to those who work in the medical field. (texasbreastfeedingcoalition.org)
In addition they need insurance and have other certificates as mandated in the area. (scanlonlouis.com)
This also helps in encryption of communications between the browsers and websites and automatically makes other certificates under it, valid. (thewindowsclub.com)