A peek behind the paper – Sarah Hamm-Alvarez on why tears are a good source of biomarkers in Parkinson’s disease

In this 'Peek Behind the Paper' series, we take a look behind the scenes of a recent Perspective in Biomarkers in Medicine entitled, 'Tears – more to them than meets the eye: why tears are a good source of biomarkers in Parkinson's disease'. Here, we ask corresponding author of the study, Sarah Hamm-Alvarez (Keck School of Medicine, CA, USA) about the rationale for using tears as a source of biomarkers for Parkinson's. We also hear more about the challenges surrounding the use of tear-based biomarkers and how they could be overcome. Can you explain your rationale for using tears as...