function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Derka, Tomáš & Figueroa, J. Manuel Tierno De', 1],
    ['Derka, Tomáš & Figueroa, J. Manuel Tierno De & Čiampor, Fedor', 5],
    ['Hamada, N. & Silva, J. O. & Pedroza, M. K.', 1],
    ['Hamada, Neusa & Silva, Jeferson Oliveira Da', 2],
    ['Ribeiro, José Moacir Ferreira & Gorayeb, Inocêncio De Sousa', 1],
    ['Ribeiro, José Moacir Ferreira & Rafael, José Albertino', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=14)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);