| doctor | I don’t believe at all 1---2---3---4---5 I believe totally |
| advertisement/media | I don’t believe at all 1---2---3---4---5 I believe totally |
| family/relatives | I don’t believe at all 1---2---3---4---5 I believe totally |
| internet | I don’t believe at all 1---2---3---4---5 I believe totally |