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The prevalence of AGA in Chinese men was lower than in caucasian men but was similar to that in Korean men; however, over the age of 60 years it was approaching that in caucasian men but was higher than that in Korean men. The most common type in Chinese men with AGA was type III vertex. Interestingly, the prevalence of AGA in Chinese women was lower than that in Korean women and caucasian women, and type I was the most common type (Ludwig classification).

Copper selenide, Cu 2 Se, CuSe, and CuSe 2 , thin films have been successfully fabricated using pulsed laser ablation of mixed targets of Cu and Se. The substrate temperature was a key factor in preparing high-quality thin films of the copper selenides, with different crystalline structures and stoichiometries. Although these three kinds of compounds ͑Cu 2 Se, CuSe, and CuSe 2 ͒ all form thin films with the same anion and cation in their chemical formula, their electrochemical properties clearly differ from each other, evidently associated with their various compositions and structures. The galvanostatic cycling measurement indicates that a Cu 2 Se/Li cell has the best cycling performance when compared to the other two possible cells, CuSe 2 /Li and CuSe/Li. The conversion reaction mechanism between Cu 2+ ͑CuSe and CuSe 2 ͒ and Cu + ͑Cu 2 Se͒ are proposed for CuSe 2 /Li and CuSe/Li cell, while the Cu 2 Se/Li cell may undergo a "displacement" reaction mechanism according to X-ray diffraction, transmission electron microscopy, and selected area electron diffraction data. These complex and unique mechanisms make copper selenides interesting materials for rechargeable lithium batteries.

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