1. The Mary M. Wohlford Laboratory for Male Contraceptive ResearchCenter for Biomedical ResearchPopulation CouncilNew YorkNew YorkUSA
2. Department of BiologyHong Kong Baptist UniversityHong KongChina
3. School of Biological SciencesUniversity of Hong KongHong KongChina
4. Department of Cell BiologyInstitute of Basic Medical SciencesChinese Academy of Medical SciencesPeking Union Medical CollegeBeijingChina
5. S.B.M. Srl PharmaceuticalsRomeItaly