PT - JOURNAL ARTICLE AU - Trevor Hancock TI - Why public health is the most challenging specialty of all AID - 10.1503/cmaj.171133 DP - 2017 Oct 16 TA - Canadian Medical Association Journal PG - E1301--E1301 VI - 189 IP - 41 4099 - http://www.cmaj.ca/content/189/41/E1301.short 4100 - http://www.cmaj.ca/content/189/41/E1301.full SO - CMAJ2017 Oct 16; 189