yes. here is one article.

June 13, 2010 at 8:16 pm

Relapse Patterns May Help Discern Guillain‐Barré from Acute CIDP
Neurology Today 20 May 2010; Volume 10(10); p 10 SAMSON, KURT

here: [url][/url]

A Brief summary-

Note- A-CIDP = acute CIDP

“The team’s initial observations were reported in a brief communication in Neurology in 2005. In that study they compared 11 patients with GBS and 13 with A-CIDP and concluded that A-CIDP should always be suspected when a patient diagnosed with GBS deteriorates after nine weeks, or when a patient experiences three or more treatment fluctuations.”

You really do need to read the whole shebang. enjoy…..