Acknowledgments
This work is part of the VNU-HCM - BMBF Project EWATEC-COAST,
supported by the German Federal Ministry of Education and Research
(BMBF) Grant No. O2WCL1217A and by the VietnamNational University
of Ho Chi Minh City (VNU-HCM) Grant No. NDT2012-24-01/HDKHCN.
We are grateful to Günter Meon (Technische Universität Braunschweig),
coordinator of EWATEC-COAST in Germany, and Nguyenhong
Quan, coordinator in Vietnam, for the opportunity to contribute to this
project.We deeply appreciate the valuable fieldwork and laboratory assistance
in Vietnam of Nguyễn Công Hiệp, Nguyễn Thái Chung, Emmi
Halonen, Jürgen Böddeker, Hoàng Trọng Khiêm and Ms. Minh. Many
thanks to Karen Hugemann and Sven Glodniok (laboratory assistance
in Germany), Katrin Naumann for the map and all colleagues who contributed
to this study. Wethank the associate editor and anonymous reviewers
for their constructive comments, which helped us to improve