短语词组短語lower extremtity venous ulcer 下肢靜脈性潰瘍chronic venous ulcer 靜脈性潰瘍lower extremity venous ulcer 下肢靜脈性潰瘍venous ulcer of lower extremities 下肢靜脈性潰瘍venous ulcer of lower extremity 下肢靜脈性潰瘍 返回 venous ulcer