Acknowledgements
We would like to thank the Gynecologic Outpatient Clinic and Gender Health Clinic at King Chulalongkorn Memorial Hospital for their support in collecting the data. Special thanks to Dr.Tanittha Chatsuwan, Department of Microbiology, Faculty of Medicine, Chulalongkorn University and her colleagues who evaluated the grade of vaginal lactobacilli. Of course, we are grateful to all subjects in this study.