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: Women who smoke and take oral contraceptives ( OCs ) have significantly increased risk of cardiovascular disease , but the exact mechanismsfor the increased risk are not known .

A: not found
****
Q: Both groups received 24 months of 1,200 mg of calcium and 400 IU of vitamin D daily and 35 mg of risedronate weekly , and the exercise group additionally had ST exercises twice weekly .

A: not found
****
Q: A physiotherapy service for EECU patients , as provided in this study , did not reduce the rate of hospital admission , rate of re-presentation to the ED , use of community healthcare resources , or improve the rate of return to usual work/home/leisure activities or patient satisfaction .

A:
EECU patients
****