In medical studies, treatments are tested within a group of study participants. You will be given a sentence of a study report in which your task is to list the phrases that give information about the participants of the study. You should list the phrases in the same order that they appear in the text, separated by commas. If no information about the participants is mentioned, just output "not found". Relevant information about participants include: gender, medical conditions, location, number of people participating. Do not contain participant mentions without relevant information.

Q: Results showed that cortisol and glucose levels were significantly high in 700 and 500 but not 3,000 mg l⁻¹ group compared to control .

A: not found
****
Q: Another clinical assessment was done 3 months after the first followup .

A: not found
****
Q: A persistent phasic activity pattern was found in 19 of the 21 patients , high frequency phasic activity in 11 of the 21 patients .

A:
21 patients
****