Correction to: Scientific Reports https://doi.org/10.1038/s41598-021-81453-8, published online 21 January 2021

The original version of this Article contained errors in the Methods and the Results sections.

In the Methods section, under the subheading ‘Study design and participants’,

“Between 2016 and 2018, patients with SED or MDD treated at a psychiatric outpatient clinic in Stockholm were consecutively included in the study.”

now reads:

“Between 2014 and 2018, patients with SED or MDD treated at a psychiatric outpatient clinic in Stockholm were consecutively included in the study.”

And,

“The study was approved by the regional Ethical Review Board in Stockholm, Sweden (http://www.epn.se/en/start/) (Dnr. 2014/585-31/1, 2016/1239-32 and 2017/970-21/1).”

now reads:

“The study was approved by the regional Ethical Review Board in Stockholm, Sweden (http://www.epn.se/en/start/) (Dnr. 2008/0061-31, 2014/585-31/1, 2016/1239-32, 2017/2088-32).”

In the Results section, under the subheading ‘Descriptive characteristics’,

“All patients with MDD and no healthy controls received antidepressant medication. There was no significant difference in EV concentration between patients with SED who received antidepressant medication (n = 5) and patients with SED who did not receive such medication (n = 26) (data not shown). In addition, there were no significant differences in the concentrations of leucocytes, erythrocytes, or platelets between patients with SED who received antidepressant medication (n = 5) and patients with SED who did not receive such medication (n = 26).”

now reads:

“24 patients with MDD, 25 patients with SED, and no healthy controls had antidepressant medication. There were no significant differences in concentrations of AQP4 and GFAP-positive EVs and EVs co-expressing AQP4/GFAP between patients with SED or MDD who received antidepressant medication (n=49) and patients with SED or MDD who did not receive such medication (n=10, missing data=3) (data not shown). In addition, there were no significant differences in the concentrations of leucocytes, erythrocytes, or platelets between patients with SED or MDD who received antidepressant medication (n=49) and patients with SED who did not receive such medication (n=10, missing data=3).”

The original Article has been corrected.