\begin{tabular}{llrl}
\toprule
      &       &  \# articles &                                                                                                                         References \\
Main domain & Dataset &              &                                                                                                                                    \\
\midrule
Affective & DEAP &            9 &                   \cite{Li2018, Alhagry2017, BenSaid2017a, Lin2017, Xu2016, Liu2016, Frydenlund2015, Jirayucharoensak2014, Li2013} \\
      & SEED &            3 &                                                                                               \cite{Zhang2018, Liu2016, Zheng2015} \\
BCI & BCI Competition &           10 &  \cite{Gao2018, Lawhern2018, Sakhavi2017, Schirrmeister2017, Tabar2016a, Manor2015, Sakhavi2015, Yang2015a, Ding2015, Cecotti2011} \\
      & eegmmidb &            8 &                           \cite{Zhang2018c, Zhang2017g, Major2017, Zhang2017d, Zhang2017a, Dharamsi2017, Normand2015, Alomari2013} \\
      & Other &            6 &                                                 \cite{Hasib2018, Lawhern2018, Schirrmeister2017, Hajinoroozi2017, Sun2016, An2016} \\
      & Keirn \& Aunon (1989) &            2 &                                                                                                  \cite{Padmanabh2017, Patnaik2017} \\
Cognitive & Other &            2 &                                                                                                 \cite{Kuanar2018, Hajinoroozi2015} \\
      & EEG Eye State &            1 &                                                                                                                  \cite{Narejo2016} \\
Epilepsy & Bonn University &            7 &                        \cite{Hussein2018, Ullah2018, Ahmedt-Aristizabal2018, Talathi2017, Acharya2017, Omerhodzic2013, Naderi2010} \\
      & CHB-MIT &            7 &                                       \cite{Tsiouris2018, Yuan2018a, Truong2018, Truong2018a, Page2016, Thodoroff2016, Turner2014} \\
      & TUH &            5 &                                                 \cite{Golmohammadi2017b, Shah2017, Golmohammadi2017a, Golmohammadi2017, Yang2016b} \\
      & Other &            3 &                                                                                     \cite{Truong2018, Golmohammadi2017a, Taqi2017} \\
      & Freiburg Hospital &            2 &                                                                                                     \cite{Truong2018, Truong2018a} \\
Generation of data & BCI Competition &            2 &                                                                                                      \cite{Corley2018, Zhang2018b} \\
      & MAHNOB &            1 &                                                                                                                    \cite{Wang2018} \\
      & Other &            1 &                                                                                                              \cite{Schwabedal2018} \\
      & SEED &            1 &                                                                                                                    \cite{Wang2018} \\
Improvement of processing tools & BCI Competition &            3 &                                                                                              \cite{Yang2018, Sturm2016, Yang2016a} \\
      & Other &            3 &                                                                                            \cite{Yepes2017, Nurse2016, Stober2015} \\
      & Bonn University &            1 &                                                                                                                     \cite{Wen2018} \\
      & CHB-MIT &            1 &                                                                                                                     \cite{Wen2018} \\
      & MAHNOB &            1 &                                                                                                             \cite{drouin2016using} \\
Others & TUH &            3 &                                                                                     \cite{Schirrmeister2017a, Roy2018, Zhang2018a} \\
      & eegmmidb &            3 &                                                                                          \cite{Zhang2018a, Zhang2017e, Zhang2017c} \\
      & Other &            2 &                                                                                                  \cite{VanPutten2018b, Zhang2018a} \\
      & EEG Eye State &            1 &                                                                                                                    \cite{Lee2018a} \\
Sleep & MASS &            4 &                                                                          \cite{Phan2018, Chambon2018, Supratak2017, dong2018mixed} \\
      & Sleep EDF &            4 &                                                                          \cite{Vilamala2017, Supratak2017, Xie2017, Tsinalis2016a} \\
      & Other &            3 &                                                                                            \cite{Sors2018, Tripathy2018, Giri2016} \\
      & UCDDB &            3 &                                                                                  \cite{Langkvist2018, Manzano2017a, Langkvist2012} \\
\bottomrule
\end{tabular}