function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alekseev, Vitalii I.', 1],
    ['Barševskis, Arvīds & Janovska, Marina & Aksjuta, Kristīna', 1],
    ['Král, David & Šípek, Petr & Sommer, David & Vondráček, Dominik', 2],
    ['Mitter, H.', 1],
    ['Mitter, Heinz', 5],
    ['Philips, T. Keith & Mudge, Alan D. & Orozco, Jesus', 1],
    ['Polat, Alper & Yildirim, Erol & Uliana, Marco', 2],
    ['Serrano, Artur R. M.', 3],
    ['Serrano, Artur R. M. & Capela, Rúben A. & Nunes, Telmo', 2],
    ['Stefanelli, Silvia & Della Rocca, Francesca & Bogliani, Giuseppe', 2],
    ['Vondráček, Dominik & Hadjiconstantis, Michael & Šípek, Petr', 10],
    ['Ziani, Stefano & Bezděk, Aleš & Branco, Tristão', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);