I have found two studies from North America (Craft et al 2008 and Robinson et al 2003) but none from Europe or Asia, and none from latitudes below 25 degrees.
Not completely, although I'd be interested in anything you find! I know Mary-Ann Smyth at the Critchton Carbon Centre and Rebekka Atrz at JHI reviewed emissions from drained peatlands and I think this review also included sequestration by in tact and restored peatlands as part of the Peatlands Code project. I've only seen a draft of their report which was marked Not for Circulation, but I think it may be available by now.
I recently led on a report looking at emissions from drained peats for a DECC project on implementing the IPCC Wetland Supplement reporting in the UK, but the draft of this report is still with DECC, so isn't ready for circulation yet. In any case this was mainly looking at drained rather than intact peats. MAS and Rebekka are working on another work package for the same project on emission/sequestration factors which might be relevant to UK peatlands but this report isn't ready yet. They might be good people to contact though.
May be of some interest here. Two papers come to my mind
http://www.pnas.org/content/112/15/4594.abstract
Turetsky, M.R., A. Kotowska, J. Bubier, N. Dise, et al. 2014. A synthesis of methane emissions from 71 northern, temperate, and subtropical peatlands. Global Change Biology 20: 2183-2197