Seasonal variation in mood in African American college students in the Washington, D.C., metropolitan area.
Agumadu CO, Yousufi SM, Malik IS, Nguyen MC, Jackson MA, Soleymani K, Thrower CM, Peterman MJ, Walters GW, Niemtzoff MJ, et al. Am J Psychiatry. 2004 Jun; 161(6):1084-9.