Retracted: Imprinted ZnO nanostructure-based electrochemical sensing of calcitonin: A clinical marker for medullary thyroid carcinoma.

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor following concerns raised by various readers. The article reports different electron micrographs for different sample preparations, but some images are of different areas from the same sample. Figure 4E is a magnified section of Figure 4C, and the images are identical as demonstrated by overlapping the images and adjusting for magnification scale. The article reports EDX spectra in Figure 5C and Figure 5D for samples that are reported as different. An overlay of the spectra indicate they are identical in magnitude and in the random fluctuations of noise except in the specific zones where the signal was expected to vary. These problems with the data presented cast doubt on all the data, and accordingly also the conclusions based on that data, in this publication. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.