How does healthcare email lists help in better performance of healthcare based companies?

i would like to know about the use of healthcare email list in marketing , for healthcare companies

Your health should be one of your major concerns. When you enter EHC-ER, your health becomes our primary concern and we will not discharge you until we are satisfied that we have done our utmost to treat your ailment or alleviate any distress or suffering you may be experiencing.
http://ehc-er.com/