Matsuta, Shuntaro http://orcid.org/0000-0003-4716-4830
Shima, Noriaki
Kakehashi, Hidenao
Kamata, Hiroe
Nakano, Shihoko
Sasaki, Keiko
Kamata, Tooru
Nishioka, Hiroshi
Miki, Akihiro
Zaitsu, Kei
Tsuchihashi, Hitoshi
Katagi, Munehiro
Article History
Received: 6 April 2018
Accepted: 19 May 2018
First Online: 28 May 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the international and/or national committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Purchased drug-free urine was used as blank sample. The analysis of drugs from the authentic human urine samples was permitted by judicial authorities and supported by official documentation.