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5 Martinez M, Soler M, Laredo FG, Belda E, Agut A. Ultrasonographic assessment of the renal size using a kidney length to vertebral body length ratio in cats. Front Vet Sci. 2022 Aug 3;9:887746. doi: 10.3389/fvets.2022.887746. PMID: 35990257; PMCID: PMC9382076.
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7 Practical small animal ultrasonography by Panagiotis Mantis, 2nd edition. 2022
8 Melian, Carlos & Pérez-López, Laura & Saavedra-Santana, Pedro & García, Antonio G. & Santos, Yaiza & Jaber, José. (2021). Ultrasound evaluation of adrenal gland size in clinically healthy dogs and in dogs with hyperadrenocorticism. The Veterinary record. 10.1002/vetr.80.
(Soulsby, S., Holland, M., Hudson, J., & Behrend, E. (2015). ULTRASONOGRAPHIC EVALUATION OF ADRENAL GLAND SIZE COMPARED TO BODY WEIGHT IN NORMAL DOGS. Veterinary Radiology & Ultrasound, 56(3), 317-326.)
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12 Griffin S. Feline abdominal ultrasonography: What’s normal? What’s abnormal? The pancreas. J Feline Med Surg. 2020 Mar;22(3):241-259. doi: 10.1177/1098612X20903599. PMID: 32093577.