Table 1.

Grade of recommendation or level of evidence criteria.

Strong/Level 1—Evidence from a large retrospective study or experimental study combined with comparative controlled trials or multiple high‐quality studies—further research unlikely to change results.

Moderate/Level 2—Case reports supported by high quality comparative studies—further research may change level.

Modest/Level 3—Clinical experiences by respected veterinarians and authors supported by comparative studies—further research could completely disapprove the interpretation.