Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Throughout the article multiple symbols were erroneous presented in incorrect forms - the correct versions are as follows:
á should be α
ê should be κ
Ä should be Δ
â should be β
¢ should be ‘
Competing Interests: No competing interests declared.
