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| Advice | n % |
| Instructor during training | 322 (78) |
| Manufacturer | 117 (28) |
| Dive team members / divers at dive site | 109 (26) |
| Social media | 55 (13) |
| Medical professional (diving physician / EMS) | 51 (12) |
| Divers Alert Network | 30 (7) |
