From 'Pen Sao' to 'Tue Pa': Understanding diverse pathways to adolescent pregnancy in Lao People's Democratic Republic through qualitative investigation with girls in Vientiane Capital, Vientiane Province, and Luang Namtha

从“Pen Sao”到“Tue Pa”：通过对万象市、万象省和琅南塔市女孩的定性调查，了解老挝人民民主共和国青少年怀孕的多种途径