(EMA: Reflection paper on stem cell-based medicinal products)
https://www.ema.europa.eu/en/documents/scientific-guideline/reflection-paper-stem-cell-based-medicinal-products_en.pdf 

(EU: Economic landscapes of human tissues and cells for clinical application in the EU)
https://ec.europa.eu/health/sites/health/files/blood_tissues_organs/docs/economiclandscapes_humantissuescells_en.pdf 

(HTA: Quality and Safety Guide)
https://www.hta.gov.uk/sites/default/files/HTA%20guide%20to%20Quality%20and%20Safety%20Assurance%20for%20Human%20Tissue%20and%20Cells%20for%20Patient%20Treatment%20v2%20April%202018.pdf 

(WHO: Human cells and tissues: the need for a global ethical framework)
https://www.who.int/bulletin/volumes/88/11/09-074542/en/