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https://link.springer.com/article/10.1007%2Fs10615-007-0108-2?sa=U&ei=xRsQVOzKI4KVPbD_gZgG&ved=0CC0Q9QEwBg&usg=AFQjCNFTToAuI9tbt53hPRmnV_leChBBsw