Response to the letter to the editor from Xue and Varadhan titled "What is missing in the validation of frailty instruments?".
Center for Stroke Research Berlin-CSB, Charité-Universitätsmedizin, Berlin, Germany.
Wolfram
W
Doehner
Center for Stroke Research Berlin-CSB, Charité-Universitätsmedizin, Berlin, Germany.
Nadja
N
Scherbakov
D016330:Frail Elderly; D006801:Humans