function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barjadze, Shalva & Kanturski, Mariusz', 3],
    ['Borges, Paulo A. V. & Gaspar, Clara', 2],
    ['Brumley, Cameron', 1],
    ['Durante, M. Pilar Mier & Ortego, Jaime & Von Dohlen, Carol D.', 3],
    ['Kanturski, Mariusz & Barjadze, Shalva', 6],
    ['Mehrparvar, Mohsen & Rakhshani, Ehsan & Rokni, Moein', 1],
    ['Nafría, Juan Manuel Nieto & Von Dohlen, Carol D.', 2],
    ['Nieto Nafría, Juan Manuel & Pérez Hidalgo, Nicolás', 1],
    ['Stekolshchikov, Andrey V.', 1],
    ['Stekolshchikov, Andrey V. & Novgorodova, Tatiana A.', 1],
    ['Stepanyan, Ilona & Barjadze, Shalva & Karagyan, Gayane', 4],
    ['Victor & Eastop, F. & Blackman, Roger L.', 8],
    ['Wieczorek, Karina & Junkiert, Łukasz & Trela, Joanna', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=37)',
    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);