This paper is the 29th consecutive installment of the annual review of research concerning
the endogenous opioid system, now spanning 30 years of research. It summarizes papers …

This paper is the twenty-fifth consecutive installment of the annual review of research
concerning the endogenous opioid system, now spanning over a quarter-century of …

This paper is the 28th consecutive installment of the annual review of research concerning
the endogenous opioid system, now spanning over a quarter-century of research. It …

This paper is the thirty-third consecutive installment of the annual review of research
concerning the endogenous opioid system. It summarizes papers published during 2010 …

This paper is the thirty-fourth consecutive installment of the annual review of research
concerning the endogenous opioid system. It summarizes papers published during 2011 …

This paper is the thirty-fifth consecutive installment of the annual review of research
concerning the endogenous opioid system. It summarizes papers published during 2012 …

This paper is the thirty-seventh consecutive installment of the annual review of research
concerning the endogenous opioid system. It summarizes papers published during 2014 …

This paper is the forty-fifth consecutive installment of the annual anthological review of
research concerning the endogenous opioid system, summarizing articles published during …

This paper is the forty-second consecutive installment of the annual anthological review of
research concerning the endogenous opioid system, summarizing articles published during …

This paper is the thirty-sixth consecutive installment of the annual review of research
concerning the endogenous opioid system. It summarizes papers published during 2013 …