Hydrogen Spectroscopy: 2S-2P Lamb Shift Transition Frequency

[Mokdad]

I'm looking for the more precise value for the 2S-2P lamb shift transition frequency.
I found the value 1 057 844.0(2.4) kHz in the National Institute of Standards and Technology website: http://physics.nist.gov/PhysRefData/HDEL/transfreq.html.
Can someone tell me if there is a better value?
Thanks.

 

[Dr Transport]

I suspect that that is the best value known to date.