The latest version of the  statement is available here: https://docs.google.com/document/d/12IeyyS4Tr_aYoNaT4SK7Zk-kBnflmGDrUxAhgjIHDq4/edit 

INSTRUCTIONS FOR SIGNATURES

We would like to strongly urge you to provide us with your institutional email address while signing this form. (Your email address will NOT be published; just used for verifying your identity.)   If you cannot provide an institutional signature, please leave a comment explaining your reason, and please provide us with some method of verifying your identity. We hope you understand these precautions, which are necessary for us to guard against fraudulent signatures.

Note: There will be a delay between filling the form and your name appearing on the letter. Do not fill out the form twice.

We request you to sign by December 16, 2019.  

UPDATE: We will continue to accept signatures post Dec 16 - please give us time to update the petition with your signatures.