function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bachvarova, Darina & Vagalinski, Boyan & Doichinov, Aleksandar', 1],
    ['Haľkova, Beata & Drabova, Martina & Mock, Andrej', 3],
    ['Kime, Richard Desmond & Enghoff, Henrik', 50],
    ['Korobushkin, Daniil I. & Semenyuk, Irina I. & Tuf, Ivan H.', 2],
    ['Lazányi, Eszter & Korsós, Zoltán', 4],
    ['Lazányi, Eszter & Vagalinski, Boyan', 26],
    ['Lazányi, Eszter & Vagalinski, Boyan & Korsós, Zoltán', 44],
    ['Mikhaljova, Elena V. & Nefediev, Pavel S. & Nefedieva, Julia S.', 1],
    ['Nefediev, P. S.', 1],
    ['Nefediev, Pavel S. & Farzalieva, Gyulli Sh. & Tuf, Ivan H.', 2],
    ['Vagalinski, Boyan & Golovatch, Sergei', 1],
    ['Vagalinski, Boyan & Golovatch, Sergei I.', 4],
    ['Vagalinski, Boyan & Lazányi, Eszter & Golovatch, Sergei', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=146)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);