Lourenço, Tânia
Paes de Faria, Joana
Bippes, Christian A.
Maia, João
Lopes-da-Silva, José A.
Relvas, João B.
Grãos, Mário
Article History
Received: 31 March 2015
Accepted: 25 January 2016
First Online: 16 February 2016
Competing interests
: Christian A. Bippes is an employee of NanoSurf AG, a manufacturer of AFM equipment. The other authors declare no competing financial interests.