TY - JOUR AU - Lewy, A J; Lefler, B J; Emens, J S TI - The circadian basis of winter depression JO - Proc Natl Acad Sci USA VL - 103 PY - 2006 DO - 10.1073/pnas.0602425103 L3 - PubMed-ID: 16648247 SP - 7414 EP - 7419 N1 -   ER -