Trier K, Cui D, Ribel-Madsen S, Guggenheim J (August 2022). "Oral administration of caffeine metabolite 7-methylxanthine is associated with slowed myopia progression in Danish children". The British Journal of Ophthalmology. 107 (10): bjophthalmol–2021–320920. doi:10.1136/bjo-2021-320920. PMID35995571. S2CID251742114.
Trier K, Cui D, Ribel-Madsen S, Guggenheim J (August 2022). "Oral administration of caffeine metabolite 7-methylxanthine is associated with slowed myopia progression in Danish children". The British Journal of Ophthalmology. 107 (10): bjophthalmol–2021–320920. doi:10.1136/bjo-2021-320920. PMID35995571. S2CID251742114.
Trier K, Cui D, Ribel-Madsen S, Guggenheim J (August 2022). "Oral administration of caffeine metabolite 7-methylxanthine is associated with slowed myopia progression in Danish children". The British Journal of Ophthalmology. 107 (10): bjophthalmol–2021–320920. doi:10.1136/bjo-2021-320920. PMID35995571. S2CID251742114.