Sigl, M.
Winstrup, M.
McConnell, J. R.
Welten, K. C.
Plunkett, G.
Ludlow, F.
Büntgen, U.
Caffee, M.
Chellman, N.
Dahl-Jensen, D.
Fischer, H.
Kipfstuhl, S.
Kostick, C.
Maselli, O. J.
Mekhaldi, F.
Mulvaney, R.
Muscheler, R.
Pasteris, D. R.
Pilcher, J. R.
Salzer, M.
Schüpbach, S.
Steffensen, J. P.
Vinther, B. M.
Woodruff, T. E.
Article History
Received: 21 November 2014
Accepted: 6 May 2015
First Online: 8 July 2015
Competing interests
: The authors declare no competing financial interests.