1. Royal Botanic Gardens Kew Millennium Seed Bank Ardingly UK
2. Department of Biosystems Katholieke Universiteit Leuven Leuven Belgium
3. Meise Botanic Garden Meise Belgium
4. Biology Department Katholieke Universiteit Leuven Leuven Belgium
5. International Institute of Tropical Agriculture Kampala Uganda
6. Bioversity International Leuven Belgium