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An unusual occurrence of a four-headed psoas major: a case report.
Pośnik M, Zielinska N, Kurtys K, Koptas K, Olewnik Ł. Pośnik M, et al. Among authors: koptas k. Folia Morphol (Warsz). 2024 May 17. doi: 10.5603/fm.98920. Online ahead of print. Folia Morphol (Warsz). 2024. PMID: 38757502 Free article.
The morphological variability of the piriformis muscle.
Olewnik Ł, Zielinska N, Ruzik K, Podgórski M, Koptas K, Karauda P, Balcerzak A, Gonera B, Tubbs RS. Olewnik Ł, et al. Among authors: koptas k. Folia Morphol (Warsz). 2024 Apr 3. doi: 10.5603/fm.97774. Online ahead of print. Folia Morphol (Warsz). 2024. PMID: 38567936 Free article.
Accessory part of the deltoid muscle.
Olewnik Ł, Zielinska N, Koptas K, Maślanka K, Ruzik K, Georgiev GP, Tubbs RS. Olewnik Ł, et al. Among authors: koptas k. Folia Morphol (Warsz). 2024;83(1):226-230. doi: 10.5603/FM.a2023.0018. Epub 2023 Mar 27. Folia Morphol (Warsz). 2024. PMID: 36967626