Antioxidants

• Shanghai China-norm Quality Technical Service Co., Ltd. — Shanghai, Shanghai Municipality, China

• Nicosia General Hospital — Stróvolos, Nicosia, Cyprus

• St John's Institute of Dermatology — London, United Kingdom

• Department of Medical Biology and Biochemistry, Ludwik Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, Karlowicza 24, 85-092 Bydgoszcz, Poland — Bydgoszcz, Kuyavian-Pomeranian Voivodeship, Poland

• Clinica Otorinolaringoiatrica — Roma, Italy

• The Chair of Medical Biology, Collegium Medicum of Nicolaus Copernicus University — Bydgoszcz, Kuyavian-Pomeranian Voivodeship, Poland
• Department of Nuclear Medicine of Center Oncology in Bydgoszcz — Bydgoszcz, Kuyavian-Pomeranian Voivodeship, Poland
• Department of Positron Emission Tomography and Molecular Diagnostics, Collegium Medicum of Nicolaus Copernicus University — Bydgoszcz, Kuyavian-Pomeranian Voivodeship, Poland

• Kuramoto Women´s Clinic — Fukuoka, Japan
• Kiba Park Clinic — Tokyo, Japan

Not specified

• Fertilitetscentrum — Gothenburg, Box 5418, Sweden

• Clinical Nutrition and Risk Factor Modification Centre; St. Michael's Hospital — Toronto, Ontario, Canada