鄭幼貞是加利福尼亚州的执照牙科医生。在太平洋大学牙科学院取得医学学位。鄭医生目前所在的医疗机构为Nathan K. Yang DDS(Nathan K. Yang DDS)，地址在380 20th Ave, San Francisco, CA 94121。除了英语以外，鄭医生还能讲普通话和广东话，并接受新病人。
陳仲蓓 Derrick Chan DDS 
Lim, Janet Janet Lim DDS 
陈永恩 Sutter Health 
Cheng, Irene Young Dental SF 
Chan, Michael SF Oral Surgery 
Lei, Shirley Smile Dental Center 
Li, Jiawei Marin Dental Wellness 
Tseng, Michael United Dental Group 
吴华杨 Wu Dental 
Jang, Gail Jang Family Dentistry 
马大捷 MA Michael T C DDS
| 陳仲蓓 | Derrick Chan DDS |
| Lim, Janet | Janet Lim DDS |
| 陈永恩 | Sutter Health |
| Cheng, Irene | Young Dental SF |
| Chan, Michael | SF Oral Surgery |
| Lei, Shirley | Smile Dental Center |
| Li, Jiawei | Marin Dental Wellness |
| Tseng, Michael | United Dental Group |
| 吴华杨 | Wu Dental |
| Jang, Gail | Jang Family Dentistry |
| 马大捷 | MA Michael T C DDS |